diff --git a/.changelog/2913.txt b/.changelog/2913.txt
new file mode 100644
index 0000000000..a72a17420a
--- /dev/null
+++ b/.changelog/2913.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_ccn_attachment: fix attachment with ccn_uin
+```
\ No newline at end of file
diff --git a/tencentcloud/services/ccn/resource_tc_ccn_attachment.go b/tencentcloud/services/ccn/resource_tc_ccn_attachment.go
index d8fce3feed..630f9027b1 100644
--- a/tencentcloud/services/ccn/resource_tc_ccn_attachment.go
+++ b/tencentcloud/services/ccn/resource_tc_ccn_attachment.go
@@ -174,33 +174,36 @@ func resourceTencentCloudCcnAttachmentRead(d *schema.ResourceData, meta interfac
 		instanceType   = d.Get("instance_type").(string)
 		instanceRegion = d.Get("instance_region").(string)
 		instanceId     = d.Get("instance_id").(string)
-		onlineHas      = true
 	)
 
-	err := resource.Retry(tccommon.ReadRetryTimeout, func() *resource.RetryError {
-		_, has, e := service.DescribeCcn(ctx, ccnId)
-		if e != nil {
-			return tccommon.RetryError(e)
-		}
+	if _, ok := d.GetOk("ccn_uin"); !ok {
+		onlineHas := true
 
-		if has == 0 {
-			d.SetId("")
-			onlineHas = false
-			return nil
-		}
+		err := resource.Retry(tccommon.ReadRetryTimeout, func() *resource.RetryError {
+			_, has, e := service.DescribeCcn(ctx, ccnId)
+			if e != nil {
+				return tccommon.RetryError(e)
+			}
 
-		return nil
-	})
+			if has == 0 {
+				d.SetId("")
+				onlineHas = false
+				return nil
+			}
 
-	if err != nil {
-		return err
-	}
+			return nil
+		})
 
-	if !onlineHas {
-		return nil
+		if err != nil {
+			return err
+		}
+
+		if !onlineHas {
+			return nil
+		}
 	}
 
-	err = resource.Retry(tccommon.ReadRetryTimeout, func() *resource.RetryError {
+	err := resource.Retry(tccommon.ReadRetryTimeout, func() *resource.RetryError {
 		info, has, e := service.DescribeCcnAttachedInstance(ctx, ccnId, instanceRegion, instanceType, instanceId)
 		if e != nil {
 			return tccommon.RetryError(e)