diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3b413e80d..16dd4b2dec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -52,6 +52,7 @@ Please mark all changes in change log and use the issue from GitHub
 -   \#3741 Inconsistent parameter names
 -   \#3811 c++ sdk segmentation fault
 -   \#3946 The result format is wrong returned by 'get collections'
+-   \#3962 The 'num' in return of search is incorrect when use http-api
 
 ## Feature
 -   \#2319 Redo metadata to support MVCC
diff --git a/core/src/server/delivery/request/GetCollectionInfoReq.cpp b/core/src/server/delivery/request/GetCollectionInfoReq.cpp
index 70f08eae31..844b16a4c5 100644
--- a/core/src/server/delivery/request/GetCollectionInfoReq.cpp
+++ b/core/src/server/delivery/request/GetCollectionInfoReq.cpp
@@ -43,6 +43,12 @@ GetCollectionInfoReq::OnExecute() {
 
         STATUS_CHECK(ValidateCollectionName(collection_name_));
 
+        bool exist = false;
+        STATUS_CHECK(DBWrapper::DB()->HasCollection(collection_name_, exist));
+        if (!exist) {
+            return Status(SERVER_COLLECTION_NOT_EXIST, "Collection not exist: " + collection_name_);
+        }
+
         engine::snapshot::CollectionPtr collection;
         engine::snapshot::FieldElementMappings field_mappings;
         STATUS_CHECK(DBWrapper::DB()->GetCollectionInfo(collection_name_, collection, field_mappings));
diff --git a/core/src/server/web_impl/handler/WebRequestHandler.cpp b/core/src/server/web_impl/handler/WebRequestHandler.cpp
index 10d5303c6b..987b3bf85f 100644
--- a/core/src/server/web_impl/handler/WebRequestHandler.cpp
+++ b/core/src/server/web_impl/handler/WebRequestHandler.cpp
@@ -826,7 +826,7 @@ WebRequestHandler::Search(const std::string& collection_name, const nlohmann::js
         }
 
         nlohmann::json result_json;
-        result_json["num"] = result->row_num_;
+        result_json["nq"] = result->row_num_;
         if (result->row_num_ == 0) {
             result_json["result"] = std::vector<int64_t>();
             result_str = result_json.dump();
diff --git a/core/unittest/server/test_web.cpp b/core/unittest/server/test_web.cpp
index c8f2779aa1..b759d1b89d 100644
--- a/core/unittest/server/test_web.cpp
+++ b/core/unittest/server/test_web.cpp
@@ -825,7 +825,7 @@ TEST_F(WebControllerTest, SEARCH) {
     //    ASSERT_EQ(milvus::server::web::StatusCode::SUCCESS, error_dto->code);
     auto result_json = nlohmann::json::parse(response->readBodyToString()->std_str());
     ASSERT_TRUE(result_json.contains("data"));
-    ASSERT_EQ(1, result_json["data"]["num"].get<int64_t>());
+    ASSERT_EQ(1, result_json["data"]["nq"].get<int64_t>());
 }
 
 TEST_F(WebControllerTest, INDEX) {