diff --git a/.changelog/2901.txt b/.changelog/2901.txt
new file mode 100644
index 0000000000..a72a17420a
--- /dev/null
+++ b/.changelog/2901.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 32b90d2979..d8fce3feed 100644
--- a/tencentcloud/services/ccn/resource_tc_ccn_attachment.go
+++ b/tencentcloud/services/ccn/resource_tc_ccn_attachment.go
@@ -169,47 +169,6 @@ func resourceTencentCloudCcnAttachmentRead(d *schema.ResourceData, meta interfac
 		service = VpcService{client: meta.(tccommon.ProviderMeta).GetAPIV3Conn()}
 	)
 
-	if v, ok := d.GetOk("ccn_uin"); ok {
-		ccnUin := v.(string)
-		ccnId := d.Get("ccn_id").(string)
-		instanceType := d.Get("instance_type").(string)
-		instanceRegion := d.Get("instance_region").(string)
-		instanceId := d.Get("instance_id").(string)
-
-		err := resource.Retry(tccommon.ReadRetryTimeout, func() *resource.RetryError {
-			infos, e := service.DescribeCcnAttachmentsByInstance(ctx, instanceType, instanceId, instanceRegion)
-			if e != nil {
-				return tccommon.RetryError(e)
-			}
-
-			if len(infos) == 0 {
-				d.SetId("")
-				return nil
-			}
-
-			findFlag := false
-			for _, info := range infos {
-				if *info.CcnUin == ccnUin && *info.CcnId == ccnId {
-					_ = d.Set("state", strings.ToUpper(*info.State))
-					_ = d.Set("attached_time", info.AttachedTime)
-					_ = d.Set("cidr_block", info.CidrBlock)
-					findFlag = true
-					break
-				}
-			}
-			if !findFlag {
-				d.SetId("")
-				return nil
-			}
-			return nil
-		})
-
-		if err != nil {
-			return err
-		}
-		return nil
-	}
-
 	var (
 		ccnId          = d.Get("ccn_id").(string)
 		instanceType   = d.Get("instance_type").(string)
@@ -252,6 +211,11 @@ func resourceTencentCloudCcnAttachmentRead(d *schema.ResourceData, meta interfac
 			return nil
 		}
 
+		if v, ok := d.GetOk("ccn_uin"); ok && v.(string) != info.ccnUin {
+			d.SetId("")
+			return nil
+		}
+
 		_ = d.Set("description", info.description)
 		_ = d.Set("route_table_id", info.routeTableId)
 		_ = d.Set("state", strings.ToUpper(info.state))
diff --git a/tencentcloud/services/ccn/resource_tc_ccn_attachment_test.go b/tencentcloud/services/ccn/resource_tc_ccn_attachment_test.go
index 677c210687..1030b3b3e5 100644
--- a/tencentcloud/services/ccn/resource_tc_ccn_attachment_test.go
+++ b/tencentcloud/services/ccn/resource_tc_ccn_attachment_test.go
@@ -14,8 +14,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
 )
 
-func TestAccTencentCloudCcnAttachmentResource(t *testing.T) {
-	t.Parallel()
+func TestAccTencentCloudCcnAttachmentResource_basic(t *testing.T) {
 	keyName := "tencentcloud_ccn_attachment.attachment"
 	keyNameVpngw := "tencentcloud_ccn_attachment.vpngw_ccn_attachment"
 	resource.Test(t, resource.TestCase{
@@ -54,6 +53,31 @@ func TestAccTencentCloudCcnAttachmentResource(t *testing.T) {
 	})
 }
 
+func TestAccTencentCloudCcnAttachmentResource_withCcnUin(t *testing.T) {
+	keyName := "tencentcloud_ccn_attachment.attachment_ccnuin"
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { tcacctest.AccPreCheck(t) },
+		Providers:    tcacctest.AccProviders,
+		CheckDestroy: testAccCheckCcnAttachmentDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccCcnAttachmentConfigWithCcnUin,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckCcnAttachmentExists(keyName),
+					resource.TestCheckResourceAttrSet(keyName, "ccn_id"),
+					resource.TestCheckResourceAttrSet(keyName, "instance_type"),
+					resource.TestCheckResourceAttrSet(keyName, "instance_region"),
+					resource.TestCheckResourceAttrSet(keyName, "instance_id"),
+					resource.TestCheckResourceAttrSet(keyName, "state"),
+					resource.TestCheckResourceAttrSet(keyName, "attached_time"),
+					resource.TestCheckResourceAttrSet(keyName, "cidr_block.#"),
+					resource.TestCheckResourceAttrSet(keyName, "route_ids.#"),
+				),
+			},
+		},
+	})
+}
+
 func testAccCheckCcnAttachmentExists(r string) resource.TestCheckFunc {
 	return func(s *terraform.State) error {
 		logId := tccommon.GetLogId(tccommon.ContextNil)
@@ -136,6 +160,35 @@ resource tencentcloud_ccn_attachment attachment {
 }
 `
 
+const testAccCcnAttachmentConfigWithCcnUin = `
+variable "region" {
+  default = "ap-guangzhou"
+}
+
+resource tencentcloud_vpc vpc {
+  name         = "ci-temp-test-vpc"
+  cidr_block   = "10.0.0.0/16"
+  dns_servers  = ["119.29.29.29", "8.8.8.8"]
+  is_multicast = false
+}
+
+resource tencentcloud_ccn main {
+  name        = "ci-temp-test-ccn"
+  description = "ci-temp-test-ccn-des"
+  qos         = "AG"
+  charge_type = "PREPAID"
+  bandwidth_limit_type = "INTER_REGION_LIMIT"
+}
+
+resource tencentcloud_ccn_attachment attachment_ccnuin {
+  ccn_id          = tencentcloud_ccn.main.id
+  ccn_uin         = "100022770164"
+  instance_type   = "VPC"
+  instance_id     = tencentcloud_vpc.vpc.id
+  instance_region = var.region
+}
+`
+
 const testAccCcnAttachmentVpngwConfig = `
 variable "region" {
   default = "ap-guangzhou"
diff --git a/tencentcloud/services/ccn/service_tencentcloud_ccn.go b/tencentcloud/services/ccn/service_tencentcloud_ccn.go
index 7573dd769b..3d983c8d22 100644
--- a/tencentcloud/services/ccn/service_tencentcloud_ccn.go
+++ b/tencentcloud/services/ccn/service_tencentcloud_ccn.go
@@ -76,6 +76,7 @@ func (info CcnBasicInfo) CreateTime() string {
 }
 
 type CcnAttachedInstanceInfo struct {
+	ccnUin         string
 	ccnId          string
 	instanceType   string
 	instanceRegion string
@@ -506,6 +507,7 @@ func (me *VpcService) DescribeCcnAttachedInstances(ctx context.Context, ccnId st
 		info.state = *item.State
 		info.description = *item.Description
 		info.routeTableId = *item.RouteTableId
+		info.ccnUin = *item.CcnUin
 		infos = append(infos, info)
 	}
 	return