diff --git a/.changelog/3123.txt b/.changelog/3123.txt
new file mode 100644
index 0000000000..ee7b931dc8
--- /dev/null
+++ b/.changelog/3123.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_as_scaling_config: update `instance_types` to limit the number of input parameters
+```
diff --git a/tencentcloud/services/as/resource_tc_as_scaling_config.go b/tencentcloud/services/as/resource_tc_as_scaling_config.go
index 7e9ec86b79..fe00983b70 100644
--- a/tencentcloud/services/as/resource_tc_as_scaling_config.go
+++ b/tencentcloud/services/as/resource_tc_as_scaling_config.go
@@ -54,7 +54,7 @@ func ResourceTencentCloudAsScalingConfig() *schema.Resource {
 				Type:        schema.TypeList,
 				Required:    true,
 				MinItems:    1,
-				MaxItems:    5,
+				MaxItems:    10,
 				Elem:        &schema.Schema{Type: schema.TypeString},
 				Description: "Specified types of CVM instances.",
 			},