diff --git a/.changelog/3561.txt b/.changelog/3561.txt
new file mode 100644
index 0000000000..434872182b
--- /dev/null
+++ b/.changelog/3561.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_cynosdb_cluster: optmize code logic
+```
diff --git a/tencentcloud/services/cynosdb/extension_cynosdb.go b/tencentcloud/services/cynosdb/extension_cynosdb.go
index 89ec08563c..fd151e6c11 100644
--- a/tencentcloud/services/cynosdb/extension_cynosdb.go
+++ b/tencentcloud/services/cynosdb/extension_cynosdb.go
@@ -453,6 +453,7 @@ func TencentCynosdbClusterBaseInfo() map[string]*schema.Schema {
 		"db_mode": {
 			Type:        schema.TypeString,
 			Optional:    true,
+			Computed:    true,
 			Description: "Specify DB mode, only available when `db_type` is `MYSQL`. Values: `NORMAL` (Default), `SERVERLESS`.",
 		},
 		"min_cpu": {