diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index b5c0575b60..592cb79c87 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -6,6 +6,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-336 - Scheduler interface
 - MS-344 - Add TaskTable Test
 - MS-345 - Add Node Test
+- MS-346 - Add some implementation of scheduler to solve compile error
 
 ## Bug
 
diff --git a/cpp/src/scheduler/Cost.cpp b/cpp/src/scheduler/Cost.cpp
new file mode 100644
index 0000000000..0f7c30c6a7
--- /dev/null
+++ b/cpp/src/scheduler/Cost.cpp
@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "Cost.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+std::vector<uint64_t>
+PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit) {
+    std::vector<uint64_t> indexes;
+    return indexes;
+}
+
+
+std::vector<uint64_t>
+PickToLoad(const TaskTable &task_table, uint64_t limit) {
+    std::vector<uint64_t> indexes;
+    return indexes;
+}
+
+
+std::vector<uint64_t>
+PickToExecute(const TaskTable &task_table, uint64_t limit) {
+    std::vector<uint64_t> indexes;
+    return indexes;
+}
+
+}
+}
+}
diff --git a/cpp/src/scheduler/Cost.h b/cpp/src/scheduler/Cost.h
index dc52eacaa3..a08833991d 100644
--- a/cpp/src/scheduler/Cost.h
+++ b/cpp/src/scheduler/Cost.h
@@ -7,8 +7,10 @@
 
 #include <vector>
 #include "Task.h"
+#include "TaskTable.h"
 #include "CacheMgr.h"
 
+
 namespace zilliz {
 namespace milvus {
 namespace engine {
@@ -20,8 +22,8 @@ namespace engine {
  * select tasks to move;
  * call from scheduler;
  */
-std::vector<TaskPtr>
-PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit) {}
+std::vector<uint64_t>
+PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit);
 
 
 /*
@@ -29,16 +31,16 @@ PickToMove(const TaskTable &task_table, const CacheMgr &cache_mgr, double limit)
  * call from resource;
  * I DONT SURE NEED THIS;
  */
-std::vector<TaskPtr>
-PickToLoad(TaskTable task_table, uint64_t limit) {}
+std::vector<uint64_t>
+PickToLoad(const TaskTable &task_table, uint64_t limit);
 
 /*
  * select task to execute;
  * call from resource;
  * I DONT SURE NEED THIS;
  */
-std::vector<TaskPtr>
-PickToExecute(TaskTable task_table, uint64_t limit) {}
+std::vector<uint64_t>
+PickToExecute(const TaskTable &task_table, uint64_t limit);
 
 
 }
diff --git a/cpp/src/scheduler/ResourceFactory.cpp b/cpp/src/scheduler/ResourceFactory.cpp
new file mode 100644
index 0000000000..65dd488e3c
--- /dev/null
+++ b/cpp/src/scheduler/ResourceFactory.cpp
@@ -0,0 +1,29 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "ResourceFactory.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+std::shared_ptr<Resource>
+ResourceFactory::Create(const std::string &name, const std::string &alias) {
+    if (name == "disk") {
+        return std::make_shared<CpuResource>(alias);
+    } else if (name == "cpu") {
+        return std::make_shared<CpuResource>(alias);
+    } else if (name == "gpu") {
+        return std::make_shared<CpuResource>(alias);
+    } else {
+        return nullptr;
+    }
+}
+
+}
+}
+}
diff --git a/cpp/src/scheduler/ResourceFactory.h b/cpp/src/scheduler/ResourceFactory.h
index f327522975..6a2ab2ab34 100644
--- a/cpp/src/scheduler/ResourceFactory.h
+++ b/cpp/src/scheduler/ResourceFactory.h
@@ -21,17 +21,7 @@ namespace engine {
 class ResourceFactory {
 public:
     static std::shared_ptr<Resource>
-    Create(const std::string &name, const std::string &alias = "") {
-        if (name == "disk") {
-            return std::make_shared<CpuResource>(alias);
-        } else if (name == "cpu") {
-            return std::make_shared<CpuResource>(alias);
-        } else if (name == "gpu") {
-            return std::make_shared<CpuResource>(alias);
-        } else {
-            return nullptr;
-        }
-    }
+    Create(const std::string &name, const std::string &alias = "");
 };
 
 
diff --git a/cpp/src/scheduler/Scheduler.cpp b/cpp/src/scheduler/Scheduler.cpp
new file mode 100644
index 0000000000..c5ae928166
--- /dev/null
+++ b/cpp/src/scheduler/Scheduler.cpp
@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "Scheduler.h"
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+void
+StartUpEvent::Process() {
+
+}
+
+void
+FinishTaskEvent::Process() {
+//        for (nei : res->neighbours) {
+//            tasks = cost(nei->task_table(), nei->connection, limit = 3)
+//            res->task_table()->PutTasks(tasks);
+//        }
+//        res->WakeUpExec();
+}
+
+void
+CopyCompletedEvent::Process() {
+
+}
+
+void
+TaskTableUpdatedEvent::Process() {
+
+}
+
+
+void
+Scheduler::Start() {
+    worker_thread_ = std::thread(&Scheduler::worker_thread_, this);
+}
+
+std::string
+Scheduler::Dump() {
+    return std::string();
+}
+
+void
+Scheduler::worker_function() {
+    while (running_) {
+        auto event = event_queue_.front();
+        event->Process();
+    }
+}
+
+}
+}
+}
diff --git a/cpp/src/scheduler/Scheduler.h b/cpp/src/scheduler/Scheduler.h
index 4bb840a68d..152937a1d2 100644
--- a/cpp/src/scheduler/Scheduler.h
+++ b/cpp/src/scheduler/Scheduler.h
@@ -10,6 +10,9 @@
 #include <thread>
 #include <queue>
 
+#include "resource/Resource.h"
+#include "ResourceMgr.h"
+
 
 namespace zilliz {
 namespace milvus {
@@ -18,8 +21,7 @@ namespace engine {
 class Event {
 public:
     explicit
-    Event(ResourceWPtr &resource)
-        : resource_(resource) {}
+    Event(ResourceWPtr &resource) : resource_(resource) {}
 
 public:
     virtual void
@@ -34,8 +36,7 @@ using EventPtr = std::shared_ptr<Event>;
 class StartUpEvent : public Event {
 public:
     explicit
-    StartUpEvent(ResourceWPtr &resource)
-        : Event(resource) {}
+    StartUpEvent(ResourceWPtr &resource) : Event(resource) {}
 
 public:
     void
@@ -45,25 +46,17 @@ public:
 class FinishTaskEvent : public Event {
 public:
     explicit
-    FinishTaskEvent(ResourceWPtr &resource)
-        : Event(resource) {}
+    FinishTaskEvent(ResourceWPtr &resource) : Event(resource) {}
 
 public:
     void
-    Process() override {
-//        for (nei : res->neighbours) {
-//            tasks = cost(nei->task_table(), nei->connection, limit = 3)
-//            res->task_table()->PutTasks(tasks);
-//        }
-//        res->WakeUpExec();
-    }
+    Process() override;
 };
 
 class CopyCompletedEvent : public Event {
 public:
     explicit
-    CopyCompletedEvent(ResourceWPtr &resource)
-        : Event(resource) {}
+    CopyCompletedEvent(ResourceWPtr &resource) : Event(resource) {}
 
 public:
     void
@@ -73,8 +66,7 @@ public:
 class TaskTableUpdatedEvent : public Event {
 public:
     explicit
-    TaskTableUpdatedEvent(ResourceWPtr &resource)
-        : Event(resource) {}
+    TaskTableUpdatedEvent(ResourceWPtr &resource) : Event(resource) {}
 
 public:
     void
@@ -94,16 +86,16 @@ public:
     }
 
     void
-    Start() {}
+    Start();
 
+public:
     /******** Events ********/
 
     /*
      * Process start up events;
      */
-    void
+    inline void
     OnStartUp(ResourceWPtr &resource) {
-        // call from res_mgr, non-blocking, if queue size over limit, exception!
         auto event = std::make_shared<StartUpEvent>(resource);
         event_queue_.push(event);
     }
@@ -111,20 +103,29 @@ public:
     /*
      * Process finish task events;
      */
-    void
-    OnFinishTask(ResourceWPtr);
+    inline void
+    OnFinishTask(ResourceWPtr &resource) {
+        auto event = std::make_shared<FinishTaskEvent>(resource);
+        event_queue_.push(event);
+    }
 
     /*
      * Process copy completed events;
      */
-    void
-    OnCopyCompleted(ResourceWPtr);
+    inline void
+    OnCopyCompleted(ResourceWPtr &resource) {
+        auto event = std::make_shared<CopyCompletedEvent>(resource);
+        event_queue_.push(event);
+    }
 
     /*
      * Process task table updated events;
      */
-    void
-    OnTaskTableUpdated(ResourceWPtr);
+    inline void
+    OnTaskTableUpdated(ResourceWPtr &resource) {
+        auto event = std::make_shared<TaskTableUpdatedEvent>(resource);
+        event_queue_.push(event);
+    }
 
 
 public:
@@ -133,13 +134,11 @@ public:
 
 
 private:
+    /*
+     * Called by worker_thread_;
+     */
     void
-    worker_function() {
-        while (running_) {
-            auto event = event_queue_.front();
-            event->Process();
-        }
-    }
+    worker_function();
 
 private:
     bool running_;
diff --git a/cpp/src/scheduler/TaskTable.cpp b/cpp/src/scheduler/TaskTable.cpp
new file mode 100644
index 0000000000..1e77318e86
--- /dev/null
+++ b/cpp/src/scheduler/TaskTable.cpp
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+
+#include "TaskTable.h"
+#include <vector>
+
+
+namespace zilliz {
+namespace milvus {
+namespace engine {
+
+TaskTable::TaskTable(std::vector<TaskPtr> &&tasks) {
+
+}
+
+void
+TaskTable::Put(TaskPtr task) {
+
+}
+
+void
+TaskTable::Put(std::vector<TaskPtr> &tasks) {
+
+}
+
+
+TaskTableItem &
+TaskTable::Get(uint64_t index) {
+    return table_[index];
+}
+
+void
+TaskTable::Clear() {
+// find first task is NOT (done or moved), erase from begin to it;
+//        auto iterator = table_.begin();
+//        while (iterator->state == TaskTableItemState::EXECUTED or
+//            iterator->state == TaskTableItemState::MOVED)
+//            iterator++;
+//        table_.erase(table_.begin(), iterator);
+}
+
+bool
+TaskTable::Move(uint64_t index) {
+    auto &task = table_[index];
+
+    std::lock_guard<std::mutex> lock(task.mutex);
+    if (task.state == TaskTableItemState::START) {
+        task.state = TaskTableItemState::LOADING;
+        return true;
+    }
+    return false;
+}
+
+bool
+TaskTable::Moved(uint64_t index) {
+    return false;
+}
+
+bool
+TaskTable::Load(uint64_t index) {
+    return false;
+}
+
+bool
+TaskTable::Loaded(uint64_t index) {
+    return false;
+}
+
+bool
+TaskTable::Execute(uint64_t index) {
+    return false;
+}
+
+bool
+TaskTable::Executed(uint64_t index) {
+    return false;
+}
+
+std::string
+TaskTable::Dump() {
+    return std::string();
+}
+
+}
+}
+}
diff --git a/cpp/src/scheduler/TaskTable.h b/cpp/src/scheduler/TaskTable.h
index 567aa6214d..caee06a731 100644
--- a/cpp/src/scheduler/TaskTable.h
+++ b/cpp/src/scheduler/TaskTable.h
@@ -47,26 +47,26 @@ public:
     TaskTable() = default;
 
     explicit
-    TaskTable(std::vector<TaskPtr> &&tasks) {}
+    TaskTable(std::vector<TaskPtr> &&tasks);
 
     /*
      * Put one task;
      */
     void
-    Put(TaskPtr task) {}
+    Put(TaskPtr task);
 
     /*
      * Put tasks back of task table;
      * Called by DBImpl;
      */
     void
-    Put(std::vector<TaskPtr> &tasks) {}
+    Put(std::vector<TaskPtr> &tasks);
 
     /*
      * Return task table item reference;
      */
     TaskTableItem &
-    Get(uint64_t index) {}
+    Get(uint64_t index);
 
     /*
      * TODO
@@ -74,14 +74,7 @@ public:
      * Called by ?
      */
     void
-    Clear() {
-        // find first task is NOT (done or moved), erase from begin to it;
-//        auto iterator = table_.begin();
-//        while (iterator->state == TaskTableItemState::EXECUTED or
-//            iterator->state == TaskTableItemState::MOVED)
-//            iterator++;
-//        table_.erase(table_.begin(), iterator);
-    }
+    Clear();
 
 
 public:
@@ -95,16 +88,7 @@ public:
 
     // TODO: bool to Status
     bool
-    Move(uint64_t index) {
-        auto &task = table_[index];
-
-        std::lock_guard<std::mutex> lock(task.mutex);
-        if (task.state == TaskTableItemState::START) {
-            task.state = TaskTableItemState::LOADING;
-            return true;
-        }
-        return false;
-    }
+    Move(uint64_t index);
 
     /*
      * Move task finished;
@@ -112,7 +96,7 @@ public:
      * Called by scheduler;
      */
     bool
-    Moved(uint64_t index) {}
+    Moved(uint64_t index);
 
     /*
      * Load a task;
@@ -120,7 +104,7 @@ public:
      * Called by loader;
      */
     bool
-    Load(uint64_t index) {}
+    Load(uint64_t index);
 
     /*
      * Load task finished;
@@ -128,7 +112,7 @@ public:
      * Called by loader;
      */
     bool
-    Loaded(uint64_t index) {}
+    Loaded(uint64_t index);
 
     /*
      * Execute a task;
@@ -136,7 +120,7 @@ public:
      * Called by executor;
      */
     bool
-    Execute(uint64_t index) {}
+    Execute(uint64_t index);
 
     /*
      * Execute task finished;
@@ -144,7 +128,7 @@ public:
      * Called by executor;
      */
     bool
-    Executed(uint64_t index) {}
+    Executed(uint64_t index);
 
 public:
     /*
diff --git a/cpp/src/scheduler/resource/Resource.h b/cpp/src/scheduler/resource/Resource.h
index 4fe2a006ac..afd3a401a6 100644
--- a/cpp/src/scheduler/resource/Resource.h
+++ b/cpp/src/scheduler/resource/Resource.h
@@ -143,11 +143,11 @@ private:
      */
     TaskPtr
     pick_task_load() {
-        auto tasks = PickToLoad(task_table_, 3);
-        for (uint64_t i = 0; i < tasks.size(); ++i) {
+        auto indexes = PickToLoad(task_table_, 3);
+        for (auto index : indexes) {
             // try to set one task loading, then return
-            if (task_table_.Load(i))
-                return task_table_.Get(i).task;
+            if (task_table_.Load(index))
+                return task_table_.Get(index).task;
             // else try next
         }
         return nullptr;
@@ -159,11 +159,11 @@ private:
      */
     TaskPtr
     pick_task_execute() {
-        auto tasks = PickToExecute(task_table_, 3);
-        for (uint64_t i = 0; i < tasks.size(); ++i) {
+        auto indexes = PickToExecute(task_table_, 3);
+        for (auto index : indexes) {
             // try to set one task executing, then return
-            if (task_table_.Execute(i))
-                return task_table_.Get(i).task;
+            if (task_table_.Execute(index))
+                return task_table_.Get(index).task;
             // else try next
         }
         return nullptr;
diff --git a/cpp/unittest/scheduler/normal_test.cpp b/cpp/unittest/scheduler/normal_test.cpp
index 1f13549b77..93b662cf73 100644
--- a/cpp/unittest/scheduler/normal_test.cpp
+++ b/cpp/unittest/scheduler/normal_test.cpp
@@ -21,7 +21,7 @@ TEST(normal_test, DISABLED_test1) {
     res_mgr->Connect(cpu, gpu1, PCIE);
     res_mgr->Connect(cpu, gpu2, PCIE);
 
-    res_mgr->StartAll();
+    res_mgr->Start();
 
     auto task1 = std::make_shared<Task>("123456789");
     auto task2 = std::make_shared<Task>("222222222");