diff --git a/tencentcloud/resource_tc_instance.go b/tencentcloud/resource_tc_instance.go
index 88e7cd2327..80faf36a03 100644
--- a/tencentcloud/resource_tc_instance.go
+++ b/tencentcloud/resource_tc_instance.go
@@ -1399,8 +1399,9 @@ func resourceTencentCloudInstanceUpdate(d *schema.ResourceData, meta interface{}
 		}
 		//tag disk ids
 		if dataDisks, ok := d.GetOk("data_disks"); ok {
-			dataDiskList := dataDisks.([]map[string]interface{})
-			for _, disk := range dataDiskList {
+			dataDiskList := dataDisks.([]interface{})
+			for _, dataDisk := range dataDiskList {
+				disk := dataDisk.(map[string]interface{})
 				dataDiskId := disk["data_disk_id"].(string)
 				resourceName = BuildTagResourceName("cvm", "volume", region, dataDiskId)
 				if err := tagService.ModifyTags(ctx, resourceName, replaceTags, deleteTags); err != nil {
diff --git a/tencentcloud/resource_tc_instance_test.go b/tencentcloud/resource_tc_instance_test.go
index 73fddbd901..9d87995f6d 100644
--- a/tencentcloud/resource_tc_instance_test.go
+++ b/tencentcloud/resource_tc_instance_test.go
@@ -946,7 +946,11 @@ resource "tencentcloud_instance" "foo" {
   image_id          = data.tencentcloud_images.default.images.0.image_id
   instance_type     = data.tencentcloud_instance_types.default.instance_types.0.instance_type
   system_disk_type  = "CLOUD_PREMIUM"
-
+  data_disks {
+    data_disk_type        = "CLOUD_PREMIUM"
+    data_disk_size        = 150
+    delete_with_instance  = true
+  }
   tags = %s
 }
 `,