diff --git a/cpp/src/license/LicenseCreateuuidshafile.cpp b/cpp/src/license/LicenseCreateuuidshafile.cpp
index 93179ba75a..597adb2cfc 100644
--- a/cpp/src/license/LicenseCreateuuidshafile.cpp
+++ b/cpp/src/license/LicenseCreateuuidshafile.cpp
@@ -6,6 +6,8 @@
 
 #include "utils/Error.h"
 #include "license/License.h"
+
+
 using namespace zilliz::vecwise;
 
 //
diff --git a/cpp/src/license/LicenseLibrary.cpp b/cpp/src/license/LicenseLibrary.cpp
index 6e757caa4b..f9cf6808d7 100644
--- a/cpp/src/license/LicenseLibrary.cpp
+++ b/cpp/src/license/LicenseLibrary.cpp
@@ -24,6 +24,18 @@ namespace server {
 
 constexpr int LicenseLibrary::sha256_length_;
 
+ServerError
+LicenseLibrary::OpenFile(const std::string &path) {
+    std::ifstream fileread;
+    fileread.open(path, std::ios::in);
+    if (!fileread) {
+        std::cout << path << "  does not exist" << std::endl;
+        return SERVER_UNEXPECTED_ERROR;
+    }
+    fileread.close();
+    return SERVER_SUCCESS;
+}
+
 ServerError
 LicenseLibrary::GetDeviceCount(int &device_count) {
     nvmlReturn_t result = nvmlInit();
@@ -139,6 +151,7 @@ LicenseLibrary::LicenseFileDeserialization(const std::string &path,
                                            int &device_count,
                                            std::map<int, std::string> &uuid_encrption_map,
                                            int64_t &remaining_hour) {
+    OpenFile(path);
     std::ifstream file(path);
     boost::archive::binary_iarchive ia(file);
     ia.register_type<LicenseFile>();
@@ -177,6 +190,7 @@ LicenseLibrary::SecretFileDeserialization(const std::string &path,
                                           time_t &update_time,
                                           off_t &file_size,
                                           std::string &file_md5) {
+    OpenFile(path);
     std::ifstream file(path);
     boost::archive::binary_iarchive ia(file);
     ia.register_type<SecretFile>();
@@ -192,23 +206,26 @@ LicenseLibrary::SecretFileDeserialization(const std::string &path,
 
 // Part 3: File attribute: UpdateTime Time/ Size/ MD5
 ServerError
-LicenseLibrary::GetFileUpdateTimeAndSize(const std::string& path, time_t& update_time, off_t& file_size) {
+LicenseLibrary::GetFileUpdateTimeAndSize(const std::string &path, time_t &update_time, off_t &file_size) {
+
+    OpenFile(path);
     struct stat buf;
     int err_no = stat(path.c_str(), &buf);
-    if(err_no != 0)
-    {
+    if (err_no != 0) {
         std::cout << strerror(err_no) << std::endl;
-        return  SERVER_UNEXPECTED_ERROR;
+        return SERVER_UNEXPECTED_ERROR;
     }
 
-    update_time =buf.st_mtime;
-    file_size =buf.st_size;
+    update_time = buf.st_mtime;
+    file_size = buf.st_size;
 
     return SERVER_SUCCESS;
 }
 
 ServerError
 LicenseLibrary::GetFileMD5(const std::string &path, std::string &filemd5) {
+
+    OpenFile(path);
     filemd5.clear();
 
     std::ifstream file(path.c_str(), std::ifstream::binary);
@@ -238,6 +255,150 @@ LicenseLibrary::GetFileMD5(const std::string &path, std::string &filemd5) {
 
     return SERVER_SUCCESS;
 }
+// Part 4: GPU Info File Serialization/Deserialization
+ServerError
+LicenseLibrary::GPUinfoFileSerialization(const std::string &path,
+                                         int device_count,
+                                         const std::map<int, std::string> &uuid_encrption_map) {
+    std::ofstream file(path);
+    boost::archive::binary_oarchive oa(file);
+    oa.register_type<GPUInfoFile>();
+
+    SerializedGPUInfoFile serialized_gpu_info_file;
+
+    serialized_gpu_info_file.set_gpu_info_file(new GPUInfoFile(device_count, uuid_encrption_map));
+    oa << serialized_gpu_info_file;
+
+    file.close();
+    return SERVER_SUCCESS;
+}
+ServerError
+LicenseLibrary::GPUinfoFileDeserialization(const std::string &path,
+                                           int &device_count,
+                                           std::map<int, std::string> &uuid_encrption_map) {
+    OpenFile(path);
+    std::ifstream file(path);
+    boost::archive::binary_iarchive ia(file);
+    ia.register_type<GPUInfoFile>();
+
+    SerializedGPUInfoFile serialized_gpu_info_file;
+    ia >> serialized_gpu_info_file;
+
+    device_count = serialized_gpu_info_file.get_gpu_info_file()->get_device_count();
+    uuid_encrption_map = serialized_gpu_info_file.get_gpu_info_file()->get_uuid_encryption_map();
+
+    file.close();
+    return SERVER_SUCCESS;
+}
+
+// Part 5: Integrity check and Legality check
+ServerError
+LicenseLibrary::IntegrityCheck(const std::string &license_file_path, const std::string &secret_file_path) {
+
+    std::string file_md5;
+    GetFileMD5(license_file_path, file_md5);
+    time_t update_time;
+    off_t file_size;
+    GetFileUpdateTimeAndSize(license_file_path, update_time, file_size);
+
+    std::string output_file_md5;
+    time_t output_update_time;
+    off_t output_file_size;
+    SecretFileDeserialization(secret_file_path, output_update_time, output_file_size, output_file_md5);
+    if (file_md5 != output_file_md5) {
+        printf("License file has been modified\n");
+        return SERVER_UNEXPECTED_ERROR;
+    }
+    if (update_time != output_update_time) {
+        printf("update_time is wrong\n");
+        return SERVER_UNEXPECTED_ERROR;
+    }
+    if (file_size != output_file_size) {
+        printf("file_size is wrong\n");
+        return SERVER_UNEXPECTED_ERROR;
+    }
+    std::cout << "Integrity Check Success" << std::endl;
+    return SERVER_SUCCESS;
+}
+
+ServerError
+LicenseLibrary::LegalityCheck(const std::string &license_file_path) {
+
+    int device_count;
+    GetDeviceCount(device_count);
+    std::vector<std::string> uuid_array;
+    GetUUID(device_count, uuid_array);
+
+    std::vector<std::string> sha_array;
+    GetUUIDSHA256(device_count, uuid_array, sha_array);
+
+    int output_device_count;
+    std::map<int, std::string> uuid_encryption_map;
+    int64_t remaining_time;
+    LicenseFileDeserialization(license_file_path, output_device_count, uuid_encryption_map, remaining_time);
+
+    if (device_count != output_device_count) {
+        printf("device_count is wrong\n");
+        return SERVER_UNEXPECTED_ERROR;
+    }
+    for (int i = 0; i < device_count; ++i) {
+        if (sha_array[i] != uuid_encryption_map[i]) {
+            printf("uuid_encryption_map %d is wrong\n", i);
+            return SERVER_UNEXPECTED_ERROR;
+        }
+    }
+    if (remaining_time <= 0) {
+        printf("License expired\n");
+        return SERVER_UNEXPECTED_ERROR;
+    }
+    std::cout << "Legality Check Success" << std::endl;
+    return SERVER_SUCCESS;
+}
+
+// Part 6: Timer
+ServerError
+LicenseLibrary::AlterFile(const std::string &license_file_path,
+                          const std::string &secret_file_path,
+                          const boost::system::error_code &ec,
+                          boost::asio::deadline_timer *pt) {
+    int device_count;
+    std::map<int, std::string> uuid_encryption_map;
+    int64_t remaining_time;
+    LicenseFileDeserialization(license_file_path, device_count, uuid_encryption_map, remaining_time);
+
+    std::cout << "remaining_time: " << remaining_time << std::endl;
+
+    if (remaining_time <= 0) {
+        std::cout << "License expired" << std::endl;
+        exit(1);
+    }
+    --remaining_time;
+    LicenseFileSerialization(license_file_path, device_count, uuid_encryption_map, remaining_time);
+
+    time_t update_time;
+    off_t file_size;
+    GetFileUpdateTimeAndSize(license_file_path, update_time, file_size);
+    std::string file_md5;
+    GetFileMD5(license_file_path, file_md5);
+    SecretFileSerialization(secret_file_path, update_time, file_size, file_md5);
+
+    pt->expires_at(pt->expires_at() + boost::posix_time::hours(1));
+    pt->async_wait(boost::bind(AlterFile, license_file_path, secret_file_path, boost::asio::placeholders::error, pt));
+    return SERVER_SUCCESS;
+}
+
+ServerError
+LicenseLibrary::StartCountingDown(const std::string &license_file_path, const std::string &secret_file_path) {
+
+    OpenFile(license_file_path);
+    OpenFile(secret_file_path);
+    boost::asio::io_service io;
+    boost::asio::deadline_timer t(io, boost::posix_time::hours(1));
+    t.async_wait(boost::bind(AlterFile, license_file_path, secret_file_path, boost::asio::placeholders::error, &t));
+    std::cout << "Timing begins" << std::endl;
+    io.run();
+    return SERVER_SUCCESS;
+}
 
 }
 }
diff --git a/cpp/src/license/LicenseLibrary.h b/cpp/src/license/LicenseLibrary.h
index d284bd4561..da79a4770d 100644
--- a/cpp/src/license/LicenseLibrary.h
+++ b/cpp/src/license/LicenseLibrary.h
@@ -2,9 +2,14 @@
 
 #include "LicenseFile.h"
 #include "SecretFile.h"
+#include "GPUInfoFile.h"
 
 #include "utils/Error.h"
 
+#include <boost/asio.hpp>
+#include <boost/thread.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
 #include <vector>
 #include <map>
 
@@ -15,6 +20,8 @@ namespace server {
 
 class LicenseLibrary {
  public:
+    static ServerError
+    OpenFile(const std::string &path);
     // Part 1: Get GPU Info
     static ServerError
     GetDeviceCount(int &device_count);
@@ -60,6 +67,32 @@ class LicenseLibrary {
     GetFileMD5(const std::string &path, std::string &filemd5);
 
     // Part 4: GPU Info File Serialization/Deserialization
+    static ServerError
+    GPUinfoFileSerialization(const std::string &path,
+                             int device_count,
+                             const std::map<int, std::string> &uuid_encrption_map);
+    static ServerError
+    GPUinfoFileDeserialization(const std::string &path,
+                               int &device_count,
+                               std::map<int, std::string> &uuid_encrption_map);
+
+    // Part 5: Integrity check and Legality check
+    static ServerError
+    IntegrityCheck(const std::string &license_file_path, const std::string &secret_file_path);
+
+    static ServerError
+    LegalityCheck(const std::string &license_file_path);
+
+    // Part 6: Timer
+    static ServerError
+    AlterFile(const std::string &license_file_path,
+              const std::string &secret_file_path,
+              const boost::system::error_code &ec,
+              boost::asio::deadline_timer *pt);
+
+    static ServerError
+    StartCountingDown(const std::string &license_file_path, const std::string &secret_file_path);
+
 
  private:
     static constexpr int sha256_length_ = 32;
diff --git a/cpp/src/license/LicensePublic.h b/cpp/src/license/LicensePublic.h
index 394dc808c8..a40b6266c5 100644
--- a/cpp/src/license/LicensePublic.h
+++ b/cpp/src/license/LicensePublic.h
@@ -30,53 +30,57 @@
 #include <openssl/md5.h>
 #include <openssl/sha.h>
 
+
 namespace zilliz {
 namespace vecwise {
 namespace server {
 
 class
-BoostArchive;
+    BoostArchive;
 
 class
-Licensedata1;
+    Licensedata1;
 
 
 class
-Licensefiledata;
+    Licensefiledata;
 
 class
-STLlicensefiledata;
+    STLlicensefiledata;
 
 
 ServerError
-LiSave(const std::string& path,const int& deviceCount,const std::map<int,std::string>& uuidEncryption);
+LiSave(const std::string &path, const int &deviceCount, const std::map<int, std::string> &uuidEncryption);
 
 ServerError
-LiLoad(const std::string& path,int& deviceCount,std::map<int,std::string>& uuidEncryption,int64_t& RemainingTime);
+LiLoad(const std::string &path, int &deviceCount, std::map<int, std::string> &uuidEncryption, int64_t &RemainingTime);
 
 ServerError
-LifileSave(const std::string& path,const time_t& update_time,const off_t& file_size,const std::string& filemd5);
+LifileSave(const std::string &path, const time_t &update_time, const off_t &file_size, const std::string &filemd5);
 
 ServerError
-LifileLoad(const std::string& path,time_t& update_time,off_t& file_size,std::string& filemd5);
+LifileLoad(const std::string &path, time_t &update_time, off_t &file_size, std::string &filemd5);
 
 ServerError
-LiSave(const std::string& path,const int& deviceCount,const std::map<int,std::string>& uuidEncryption, const int64_t& RemainingTime);
+LiSave(const std::string &path,
+       const int &deviceCount,
+       const std::map<int, std::string> &uuidEncryption,
+       const int64_t &RemainingTime);
 
 ServerError
-LicenseIntegrity_check(const std::string& path,const std::string& path2);
+LicenseIntegrity_check(const std::string &path, const std::string &path2);
 
 ServerError
-LicenseLegality_check(const std::string& path);
+LicenseLegality_check(const std::string &path);
 
 void
-Alterfile(const std::string &path1, const std::string &path2 ,const boost::system::error_code &ec, boost::asio::deadline_timer* pt);
+Alterfile(const std::string &path1,
+          const std::string &path2,
+          const boost::system::error_code &ec,
+          boost::asio::deadline_timer *pt);
 
 void
-Runtime(const std::string &path1, const std::string &path2 );
-
-
-
+Runtime(const std::string &path1, const std::string &path2);
 
 
 }
diff --git a/cpp/src/license/LicenseRun.cpp b/cpp/src/license/LicenseRun.cpp
index a059d2f7e2..93c6c463b0 100644
--- a/cpp/src/license/LicenseRun.cpp
+++ b/cpp/src/license/LicenseRun.cpp
@@ -8,6 +8,8 @@
 #include "utils/Error.h"
 #include "license/License.h"
 #include "license/LicensePublic.h"
+
+
 using namespace zilliz::vecwise;
 
 //TEST(LicenseTest, LICENSE_TEST) {
diff --git a/cpp/unittest/license/license_library_tests.cpp b/cpp/unittest/license/license_library_tests.cpp
index eb8b10b8b9..ddce463d9a 100644
--- a/cpp/unittest/license/license_library_tests.cpp
+++ b/cpp/unittest/license/license_library_tests.cpp
@@ -62,6 +62,7 @@ TEST(LicenseLibraryTest, LICENSE_FILE_TEST) {
     err = server::LicenseLibrary::GetUUIDSHA256(device_count, uuid_array, uuid_sha256_array);
     ASSERT_EQ(err, server::SERVER_SUCCESS);
 
+
     // 4. Set a file name
     std::string license_file_path("/tmp/megasearch.license");
 
@@ -74,19 +75,44 @@ TEST(LicenseLibraryTest, LICENSE_FILE_TEST) {
         uuid_encrption_map[i] = uuid_sha256_array[i];
     }
 
-    // 7. Generate License File
+    // 7.GPU_info File
+    std::string GPU_info_file_path("/tmp/megasearch.info");
+
+
+    // 8. Generate GPU_info File
+    err = server::LicenseLibrary::GPUinfoFileSerialization(GPU_info_file_path,
+                                                           device_count,
+                                                           uuid_encrption_map);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 9. Define output var
+    int output_info_device_count = 0;
+    std::map<int, std::string> output_info_uuid_encrption_map;
+
+    // 10. Read GPU_info File
+    err = server::LicenseLibrary::GPUinfoFileDeserialization(GPU_info_file_path,
+                                                             output_info_device_count,
+                                                             output_info_uuid_encrption_map);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    ASSERT_EQ(device_count, output_info_device_count);
+    for (int i = 0; i < device_count; ++i) {
+        ASSERT_EQ(uuid_encrption_map[i], output_info_uuid_encrption_map[i]);
+    }
+
+    // 11. Generate License File
     err = server::LicenseLibrary::LicenseFileSerialization(license_file_path,
                                                            device_count,
                                                            uuid_encrption_map,
                                                            remaining_hour);
     ASSERT_EQ(err, server::SERVER_SUCCESS);
 
-    // 8. Define output var
+    // 12. Define output var
     int output_device_count = 0;
     std::map<int, std::string> output_uuid_encrption_map;
-    int64_t output_remaining_hour = 0;
+    int64_t output_remaining_hour;
 
-    // 9. Read License File
+    // 13. Read License File
     err = server::LicenseLibrary::LicenseFileDeserialization(license_file_path,
                                                              output_device_count,
                                                              output_uuid_encrption_map,
@@ -99,28 +125,28 @@ TEST(LicenseLibraryTest, LICENSE_FILE_TEST) {
         ASSERT_EQ(uuid_encrption_map[i], output_uuid_encrption_map[i]);
     }
 
-    // 10. Get License File Attribute
+    // 14. Get License File Attribute
     time_t update_time;
     off_t file_size;
     err = server::LicenseLibrary::GetFileUpdateTimeAndSize(license_file_path, update_time, file_size);
     ASSERT_EQ(err, server::SERVER_SUCCESS);
 
-    // 11. Get License File MD5
+    // 15. Get License File MD5
     std::string file_md5;
     err = server::LicenseLibrary::GetFileMD5(license_file_path, file_md5);
     ASSERT_EQ(err, server::SERVER_SUCCESS);
 
-    // 12. Generate Secret File
+    // 16. Generate Secret File
     std::string secret_file_path("/tmp/megasearch.secret");
     err = server::LicenseLibrary::SecretFileSerialization(secret_file_path, update_time, file_size, file_md5);
     ASSERT_EQ(err, server::SERVER_SUCCESS);
 
-    // 13. Define output var
+    // 17. Define output var
     time_t output_update_time;
     off_t output_file_size;
     std::string output_file_md5;
 
-    // 14. Read License File
+    // 18. Read License File
     err = server::LicenseLibrary::SecretFileDeserialization(secret_file_path,
                                                             output_update_time,
                                                             output_file_size,
@@ -131,4 +157,126 @@ TEST(LicenseLibraryTest, LICENSE_FILE_TEST) {
     ASSERT_EQ(file_size, output_file_size);
     ASSERT_EQ(file_md5, output_file_md5);
 
+    // 19. Integrity check and Legality check
+    err = server::LicenseLibrary::IntegrityCheck(license_file_path, secret_file_path);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    err = server::LicenseLibrary::LegalityCheck(license_file_path);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+}
+
+TEST(LicenseLibraryTest, Timer_TEST) {
+
+    server::ServerError err;
+    std::string license_file_path("/tmp/megasearch.license");
+    std::string secret_file_path("/tmp/megasearch.secret");
+
+    // 19. Integrity check and Legality check
+    err = server::LicenseLibrary::IntegrityCheck(license_file_path, secret_file_path);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    err = server::LicenseLibrary::LegalityCheck(license_file_path);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 20. Start counting down
+    err = server::LicenseLibrary::StartCountingDown(license_file_path, secret_file_path);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+}
+
+TEST(LicenseLibraryTest, GET_GPU_INFO_FILE) {
+
+    // 1. Get Device Count
+    int device_count = 0;
+    server::ServerError err = server::LicenseLibrary::GetDeviceCount(device_count);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 2. Get All GPU UUID
+    std::vector<std::string> uuid_array;
+    err = server::LicenseLibrary::GetUUID(device_count, uuid_array);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 3. Get UUID SHA256
+    std::vector<std::string> uuid_sha256_array;
+    err = server::LicenseLibrary::GetUUIDSHA256(device_count, uuid_array, uuid_sha256_array);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 4. Generate GPU ID map with GPU UUID
+    std::map<int, std::string> uuid_encrption_map;
+    for (int i = 0; i < device_count; ++i) {
+        uuid_encrption_map[i] = uuid_sha256_array[i];
+    }
+
+    // 5.GPU_info File
+    std::string GPU_info_file_path("/tmp/megasearch.info");
+
+    // 6. Generate GPU_info File
+    err = server::LicenseLibrary::GPUinfoFileSerialization(GPU_info_file_path,
+                                                           device_count,
+                                                           uuid_encrption_map);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    std::cout << "Generate GPU_info File Success" << std::endl;
+}
+
+TEST(LicenseLibraryTest, GET_LICENSE_FILE) {
+
+    server::ServerError err;
+    // 1.GPU_info File
+    std::string GPU_info_file_path("/tmp/megasearch.info");
+
+    // 2. License File
+    std::string license_file_path("/tmp/megasearch.license");
+
+    // 3. Define output var
+    int output_info_device_count = 0;
+    std::map<int, std::string> output_info_uuid_encrption_map;
+
+    // 4. Read GPU_info File
+    err = server::LicenseLibrary::GPUinfoFileDeserialization(GPU_info_file_path,
+                                                             output_info_device_count,
+                                                             output_info_uuid_encrption_map);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 5. Enter time
+    int64_t remaining_hour = 5;
+    std::cout << "Please enter the authorization time (hours)" << std::endl;
+//    std::cin >> remaining_hour;
+    err = server::LicenseLibrary::LicenseFileSerialization(license_file_path,
+                                                           output_info_device_count,
+                                                           output_info_uuid_encrption_map,
+                                                           remaining_hour);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+    std::cout << "Generate License File Success" << std::endl;
+
+}
+
+TEST(LicenseLibraryTest, GET_SECRET_FILE) {
+
+    server::ServerError err;
+    std::string license_file_path("/tmp/megasearch.license");
+    std::string secret_file_path("/tmp/megasearch.secret");
+
+    // 14. Get License File Attribute
+    time_t update_time;
+    off_t file_size;
+    err = server::LicenseLibrary::GetFileUpdateTimeAndSize(license_file_path, update_time, file_size);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 15. Get License File MD5
+    std::string file_md5;
+    err = server::LicenseLibrary::GetFileMD5(license_file_path, file_md5);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    // 16. Generate Secret File
+    err = server::LicenseLibrary::SecretFileSerialization(secret_file_path, update_time, file_size, file_md5);
+    ASSERT_EQ(err, server::SERVER_SUCCESS);
+
+    std::cout << "Generate Secret File Success" << std::endl;
+}
+
+TEST(LicenseLibraryTest, CIN_TEST) {
+    int a;
+    std::cin >> a;
+    std::cout << 2 * a << std::endl;
 }
\ No newline at end of file