diff --git a/.changelog/3550.txt b/.changelog/3550.txt
new file mode 100644
index 0000000000..9ba32bcde2
--- /dev/null
+++ b/.changelog/3550.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_monitor_tmpInstance: Update the description of the `data_retention_time` field.
+```
\ No newline at end of file
diff --git a/tencentcloud/services/tmp/resource_tc_monitor_tmp_instance.go b/tencentcloud/services/tmp/resource_tc_monitor_tmp_instance.go
index 6010588231..6ab73237de 100644
--- a/tencentcloud/services/tmp/resource_tc_monitor_tmp_instance.go
+++ b/tencentcloud/services/tmp/resource_tc_monitor_tmp_instance.go
@@ -47,7 +47,7 @@ func ResourceTencentCloudMonitorTmpInstance() *schema.Resource {
 			"data_retention_time": {
 				Type:        schema.TypeInt,
 				Required:    true,
-				Description: "Data retention time(in days). Value range: 15, 30, 45, 90, 180, 360, 720.",
+				Description: "Data retention time(in days). Value range: 15, 30, 45, 90, 180, 365, 730.",
 			},
 
 			"zone": {
diff --git a/website/docs/r/monitor_tmp_instance.html.markdown b/website/docs/r/monitor_tmp_instance.html.markdown
index 10cf772f9c..9cb73463ad 100644
--- a/website/docs/r/monitor_tmp_instance.html.markdown
+++ b/website/docs/r/monitor_tmp_instance.html.markdown
@@ -46,7 +46,7 @@ resource "tencentcloud_monitor_tmp_instance" "example" {
 
 The following arguments are supported:
 
-* `data_retention_time` - (Required, Int) Data retention time(in days). Value range: 15, 30, 45, 90, 180, 360, 720.
+* `data_retention_time` - (Required, Int) Data retention time(in days). Value range: 15, 30, 45, 90, 180, 365, 730.
 * `instance_name` - (Required, String) Instance name.
 * `subnet_id` - (Required, String) Subnet Id.
 * `vpc_id` - (Required, String) Vpc Id.