diff --git a/flexibleengine/acceptance/acceptance.go b/flexibleengine/acceptance/acceptance.go
index 265460d8..c2136235 100644
--- a/flexibleengine/acceptance/acceptance.go
+++ b/flexibleengine/acceptance/acceptance.go
@@ -15,12 +15,12 @@ import (
 )
 
 var (
-	OS_DEPRECATED_ENVIRONMENT = os.Getenv("OS_DEPRECATED_ENVIRONMENT")
-	OS_AVAILABILITY_ZONE      = os.Getenv("OS_AVAILABILITY_ZONE")
-	OS_REGION_NAME            = os.Getenv("OS_REGION_NAME")
-	OS_ACCESS_KEY             = os.Getenv("OS_ACCESS_KEY")
-	OS_SECRET_KEY             = os.Getenv("OS_SECRET_KEY")
-	OS_PROJECT_ID             = os.Getenv("OS_PROJECT_ID")
+	OS_DEPRECATED_ENVIRONMENT     = os.Getenv("OS_DEPRECATED_ENVIRONMENT")
+	OS_AVAILABILITY_ZONE          = os.Getenv("OS_AVAILABILITY_ZONE")
+	OS_REGION_NAME                = os.Getenv("OS_REGION_NAME")
+	OS_ACCESS_KEY                 = os.Getenv("OS_ACCESS_KEY")
+	OS_SECRET_KEY                 = os.Getenv("OS_SECRET_KEY")
+	OS_PROJECT_ID                 = os.Getenv("OS_PROJECT_ID")
 
 	OS_VPC_ID     = os.Getenv("OS_VPC_ID")
 	OS_NETWORK_ID = os.Getenv("OS_NETWORK_ID")
diff --git a/flexibleengine/acceptance/data_source_flexibleengine_dms_maintainwindow_test.go b/flexibleengine/acceptance/data_source_flexibleengine_dms_maintainwindow_test.go
new file mode 100644
index 00000000..bd5e37d9
--- /dev/null
+++ b/flexibleengine/acceptance/data_source_flexibleengine_dms_maintainwindow_test.go
@@ -0,0 +1,35 @@
+package acceptance
+
+import (
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+
+	"github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance"
+)
+
+func TestAccDmsMaintainWindowDataSource_basic(t *testing.T) {
+	dataSourceName := "data.flexibleengine_dms_maintainwindow.maintainwindow1"
+	dc := acceptance.InitDataSourceCheck(dataSourceName)
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:          func() { testAccPreCheck(t) },
+		ProviderFactories: TestAccProviderFactories,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccDmsMaintainWindowDataSource_basic,
+				Check: resource.ComposeTestCheckFunc(
+					dc.CheckResourceExists(),
+					resource.TestCheckResourceAttr(dataSourceName, "seq", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "begin", "22:00:00"),
+				),
+			},
+		},
+	})
+}
+
+var testAccDmsMaintainWindowDataSource_basic = `
+data "flexibleengine_dms_maintainwindow" "maintainwindow1" {
+  seq = 1
+}
+`
diff --git a/flexibleengine/provider.go b/flexibleengine/provider.go
index 6be2041f..6bdfdc30 100644
--- a/flexibleengine/provider.go
+++ b/flexibleengine/provider.go
@@ -296,6 +296,7 @@ func Provider() *schema.Provider {
 			"flexibleengine_dms_kafka_instances":    dms.DataSourceDmsKafkaInstances(),
 			"flexibleengine_dms_rocketmq_broker":    dms.DataSourceDmsRocketMQBroker(),
 			"flexibleengine_dms_rocketmq_instances": dms.DataSourceDmsRocketMQInstances(),
+			"flexibleengine_dms_maintainwindow":     dms.DataSourceDmsMaintainWindow(),
 
 			"flexibleengine_dws_flavors":      dws.DataSourceDwsFlavors(),
 			"flexibleengine_elb_certificate":  elb.DataSourceELBCertificateV3(),