diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index e7f1cc74e1..72cf488cba 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -41,6 +41,8 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-400 - Add timestamp record in task state change function
 - MS-402 - Add dump implementation for TaskTableItem
 - MS-403 - Add GpuCacheMgr
+- MS-404 - Release index after search task done avoid memory increment continues
+- MS-405 - Add delete task support
 
 ## New Feature
 - MS-343 - Implement ResourceMgr
diff --git a/cpp/src/scheduler/ResourceMgr.cpp b/cpp/src/scheduler/ResourceMgr.cpp
index cf54472732..f341821392 100644
--- a/cpp/src/scheduler/ResourceMgr.cpp
+++ b/cpp/src/scheduler/ResourceMgr.cpp
@@ -17,6 +17,17 @@ ResourceMgr::ResourceMgr()
 
 }
 
+uint64_t
+ResourceMgr::GetNumOfComputeResource() {
+    uint64_t count = 0;
+    for (auto &res : resources_) {
+        if (res->HasExecutor()) {
+            ++count;
+        }
+    }
+    return count;
+}
+
 ResourceWPtr
 ResourceMgr::Add(ResourcePtr &&resource) {
     ResourceWPtr ret(resource);
diff --git a/cpp/src/scheduler/ResourceMgr.h b/cpp/src/scheduler/ResourceMgr.h
index c3f900b2db..54ff551b6b 100644
--- a/cpp/src/scheduler/ResourceMgr.h
+++ b/cpp/src/scheduler/ResourceMgr.h
@@ -35,6 +35,12 @@ public:
         return disk_resources_;
     }
 
+    /*
+     * Return account of resource which enable executor;
+     */
+    uint64_t
+    GetNumOfComputeResource();
+
     /*
      * Add resource into Resource Management;
      * Generate functions on events;
diff --git a/cpp/src/scheduler/task/DeleteTask.cpp b/cpp/src/scheduler/task/DeleteTask.cpp
index ee6b63b770..9f76de506e 100644
--- a/cpp/src/scheduler/task/DeleteTask.cpp
+++ b/cpp/src/scheduler/task/DeleteTask.cpp
@@ -6,10 +6,14 @@
 
 #include "DeleteTask.h"
 
+
 namespace zilliz {
 namespace milvus {
 namespace engine {
 
+XDeleteTask::XDeleteTask(DeleteContextPtr &delete_context)
+    : delete_context_ptr_(delete_context) {}
+
 void
 XDeleteTask::Load(LoadType type, uint8_t device_id) {
 
@@ -17,12 +21,13 @@ XDeleteTask::Load(LoadType type, uint8_t device_id) {
 
 void
 XDeleteTask::Execute() {
-
+    delete_context_ptr_->ResourceDone();
 }
 
 TaskPtr
 XDeleteTask::Clone() {
-    return nullptr;
+    auto task = std::make_shared<XDeleteTask>(delete_context_ptr_);
+    return task;
 }
 
 }
diff --git a/cpp/src/scheduler/task/DeleteTask.h b/cpp/src/scheduler/task/DeleteTask.h
index 9ca4e8b53a..2b26624391 100644
--- a/cpp/src/scheduler/task/DeleteTask.h
+++ b/cpp/src/scheduler/task/DeleteTask.h
@@ -5,6 +5,7 @@
  ******************************************************************************/
 #pragma once
 
+#include <src/db/scheduler/context/DeleteContext.h>
 #include "Task.h"
 
 
@@ -14,6 +15,9 @@ namespace engine {
 
 class XDeleteTask : public Task {
 public:
+    explicit
+    XDeleteTask(DeleteContextPtr &delete_context);
+
     void
     Load(LoadType type, uint8_t device_id) override;
 
@@ -22,6 +26,9 @@ public:
 
     TaskPtr
     Clone() override;
+
+public:
+    DeleteContextPtr delete_context_ptr_;
 };
 
 }
diff --git a/cpp/src/scheduler/task/SearchTask.cpp b/cpp/src/scheduler/task/SearchTask.cpp
index ea482bcb72..992e915f23 100644
--- a/cpp/src/scheduler/task/SearchTask.cpp
+++ b/cpp/src/scheduler/task/SearchTask.cpp
@@ -207,6 +207,9 @@ XSearchTask::Execute() {
     CollectDurationMetrics(index_type_, total_time);
 
     rc.ElapseFromBegin("totally cost");
+
+    // release index in resource
+    index_engine_ = nullptr;
 }
 
 TaskPtr
diff --git a/cpp/src/scheduler/task/Task.h b/cpp/src/scheduler/task/Task.h
index 5671648097..4d78894d31 100644
--- a/cpp/src/scheduler/task/Task.h
+++ b/cpp/src/scheduler/task/Task.h
@@ -35,6 +35,7 @@ public:
     virtual void
     Execute() = 0;
 
+    // TODO: dont use this method to support task move
     virtual TaskPtr
     Clone() = 0;
 
diff --git a/cpp/src/scheduler/task/TaskConvert.cpp b/cpp/src/scheduler/task/TaskConvert.cpp
index f29fd29604..43f70903dc 100644
--- a/cpp/src/scheduler/task/TaskConvert.cpp
+++ b/cpp/src/scheduler/task/TaskConvert.cpp
@@ -22,8 +22,9 @@ TaskConvert(const ScheduleTaskPtr &schedule_task) {
             return task;
         }
         case ScheduleTaskType::kDelete: {
-            // TODO: convert to delete task
-            return nullptr;
+            auto delete_task = std::static_pointer_cast<DeleteTask>(schedule_task);
+            auto task = std::make_shared<XDeleteTask>(delete_task->context_);
+            return task;
         }
         default: {
             // TODO: unexpected !!!
diff --git a/cpp/src/scheduler/task/TaskConvert.h b/cpp/src/scheduler/task/TaskConvert.h
index 471592f993..bfc2df760b 100644
--- a/cpp/src/scheduler/task/TaskConvert.h
+++ b/cpp/src/scheduler/task/TaskConvert.h
@@ -4,9 +4,11 @@
  * Proprietary and confidential.
  ******************************************************************************/
 
-#include "src/db/scheduler/task/IndexLoadTask.h"
+#include "db/scheduler/task/DeleteTask.h"
+#include "db/scheduler/task/IndexLoadTask.h"
 #include "Task.h"
 #include "SearchTask.h"
+#include "DeleteTask.h"
 
 namespace zilliz {
 namespace milvus {