diff --git a/CHANGELOG.md b/CHANGELOG.md
index 348c38a4f8..8cbf04804a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
 ## 1.42.1 (Unreleased)
+
+BUG FIXES:
+* Resource: `tencentcloud_mongodb_instance` Fix the error of releasing associated resources when destroying mongodb postpaid instance.
+* Resource: `tencentcloud_mongodb_sharding_instance` Fix the error of releasing associated resources when destroying mongodb postpaid sharding instance.
+* Resource: `tencentcloud_mongodb_standby_instance` Fix the error of releasing associated resources when destroying mongodb postpaid standby instance.
+
 ## 1.42.0 (September 8, 2020)
 
 FEATURES:
diff --git a/tencentcloud/resource_tc_mongodb_instance.go b/tencentcloud/resource_tc_mongodb_instance.go
index c985232cb6..b86c06c671 100644
--- a/tencentcloud/resource_tc_mongodb_instance.go
+++ b/tencentcloud/resource_tc_mongodb_instance.go
@@ -511,6 +511,18 @@ func resourceTencentCloudMongodbInstanceDelete(d *schema.ResourceData, meta inte
 	if err != nil {
 		return err
 	}
-
-	return nil
+	err = mongodbService.OfflineIsolatedDBInstance(ctx, instanceId)
+	if err != nil {
+		log.Printf("[CRITAL]%s mongodb %s fail, reason:%s", logId, "OfflineIsolatedDBInstance", err.Error())
+		return err
+	}
+	//describe and check not exist
+	_, has, errRet := mongodbService.DescribeInstanceById(ctx, instanceId)
+	if errRet != nil {
+		return errRet
+	}
+	if !has {
+		return nil
+	}
+	return fmt.Errorf("[CRITAL]%s mongodb %s fail", logId, "OfflineIsolatedDBInstance")
 }
diff --git a/tencentcloud/resource_tc_mongodb_sharding_instance.go b/tencentcloud/resource_tc_mongodb_sharding_instance.go
index c0b6a17427..29938c1405 100644
--- a/tencentcloud/resource_tc_mongodb_sharding_instance.go
+++ b/tencentcloud/resource_tc_mongodb_sharding_instance.go
@@ -506,6 +506,18 @@ func resourceMongodbShardingInstanceDelete(d *schema.ResourceData, meta interfac
 	if err != nil {
 		return err
 	}
-
-	return nil
+	err = mongodbService.OfflineIsolatedDBInstance(ctx, instanceId)
+	if err != nil {
+		log.Printf("[CRITAL]%s mongodb %s fail, reason:%s", logId, "OfflineIsolatedDBInstance", err.Error())
+		return err
+	}
+	//describe and check not exist
+	_, has, errRet := mongodbService.DescribeInstanceById(ctx, instanceId)
+	if errRet != nil {
+		return errRet
+	}
+	if !has {
+		return nil
+	}
+	return fmt.Errorf("[CRITAL]%s mongodb %s fail", logId, "OfflineIsolatedDBInstance")
 }
diff --git a/tencentcloud/resource_tc_mongodb_standby_instance.go b/tencentcloud/resource_tc_mongodb_standby_instance.go
index cc44171ccf..f90889fbc7 100644
--- a/tencentcloud/resource_tc_mongodb_standby_instance.go
+++ b/tencentcloud/resource_tc_mongodb_standby_instance.go
@@ -556,6 +556,18 @@ func resourceTencentCloudMongodbStandbyInstanceDelete(d *schema.ResourceData, me
 	if err != nil {
 		return err
 	}
-
-	return nil
+	err = mongodbService.OfflineIsolatedDBInstance(ctx, instanceId)
+	if err != nil {
+		log.Printf("[CRITAL]%s mongodb %s fail, reason:%s", logId, "OfflineIsolatedDBInstance", err.Error())
+		return err
+	}
+	//describe and check not exist
+	_, has, errRet := mongodbService.DescribeInstanceById(ctx, instanceId)
+	if errRet != nil {
+		return errRet
+	}
+	if !has {
+		return nil
+	}
+	return fmt.Errorf("[CRITAL]%s mongodb %s fail", logId, "OfflineIsolatedDBInstance")
 }
diff --git a/tencentcloud/service_tencentcloud_mongodb.go b/tencentcloud/service_tencentcloud_mongodb.go
index 443476690f..ec116e0477 100644
--- a/tencentcloud/service_tencentcloud_mongodb.go
+++ b/tencentcloud/service_tencentcloud_mongodb.go
@@ -313,3 +313,43 @@ func (me *MongodbService) DescribeAsyncRequestInfo(ctx context.Context, asyncId
 
 	return nil
 }
+
+func (me *MongodbService) OfflineIsolatedDBInstance(ctx context.Context, instanceId string) (errRet error) {
+	logId := getLogId(ctx)
+	request := mongodb.NewOfflineIsolatedDBInstanceRequest()
+	request.InstanceId = &instanceId
+	defer func() {
+		if errRet != nil {
+			log.Printf("[CRITAL]%s api[%s] fail,reason[%s]", logId, request.GetAction(), errRet.Error())
+		}
+	}()
+	var response *mongodb.OfflineIsolatedDBInstanceResponse
+	var err error
+	err = resource.Retry(writeRetryTimeout, func() *resource.RetryError {
+		ratelimit.Check(request.GetAction())
+		response, err = me.client.UseMongodbClient().OfflineIsolatedDBInstance(request)
+		if err != nil {
+			if ee, ok := err.(*sdkErrors.TencentCloudSDKError); ok {
+				if ee.Code == "InvalidParameterValue.LockFailed" {
+					return resource.RetryableError(err)
+				} else {
+					return resource.NonRetryableError(err)
+				}
+			}
+			log.Printf("[CRITAL]%s api[%s] fail, reason:%s", logId, request.GetAction(), err.Error())
+			return resource.NonRetryableError(err)
+		}
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+	if response != nil && response.Response != nil {
+		if err = me.DescribeAsyncRequestInfo(ctx, *response.Response.AsyncRequestId); err != nil {
+			return err
+		}
+	}
+	log.Printf("[DEBUG]%s api[%s] success, request body [%s], response body [%s]",
+		logId, request.GetAction(), request.ToJsonString(), response.ToJsonString())
+	return nil
+}