diff --git a/openstack/ddm/instances/QueryInstanceDetails.go b/openstack/ddm/instances/QueryInstanceDetails.go
new file mode 100644
index 000000000..45f25b6d4
--- /dev/null
+++ b/openstack/ddm/instances/QueryInstanceDetails.go
@@ -0,0 +1,75 @@
+package instances
+
+import (
+	golangsdk "github.com/opentelekomcloud/gophertelekomcloud"
+	"github.com/opentelekomcloud/gophertelekomcloud/internal/extract"
+)
+
+func QueryInstanceDetails(client *golangsdk.ServiceClient, instanceId string) (*QueryInstanceDetailsResponse, error) {
+
+	// GET /v1/{project_id}/instances/{instance_id}
+	raw, err := client.Get(client.ServiceURL("instances", instanceId), nil, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var res QueryInstanceDetailsResponse
+	err = extract.Into(raw.Body, &res)
+	return &res, err
+}
+
+type QueryInstanceDetailsResponse struct {
+	// DDM instance ID
+	Id string `json:"id"`
+	// DDM instance status. For details about this parameter value, see Status Description at
+	// https://docs.otc.t-systems.com/distributed-database-middleware/api-ref/appendix/status_description.html
+	Status string `json:"status"`
+	// DDM instance name
+	Name string `json:"name"`
+	// Time when the DDM instance is created
+	Created string `json:"created"`
+	// Time when the DDM instance is last updated
+	Updated string `json:"updated"`
+	// Name of the AZ where the DDM instance is located
+	AvailableZone string `json:"available_zone"`
+	// VPC ID
+	VpcId string `json:"vpc_id"`
+	// Subnet ID
+	SubnetId string `json:"subnet_id"`
+	// Security group ID
+	SecurityGroupId string `json:"security_group_id"`
+	// Number of nodes
+	NodeCount int `json:"node_count"`
+	// Address for accessing the DDM instance
+	AccessIp string `json:"access_ip"`
+	// Port for accessing the DDM instance
+	AccessPort string `json:"access_port"`
+	// Node status. For details, see Status Description.
+	NodeStatus string `json:"node_status"`
+	// Number of CPUs
+	CoreCount string `json:"core_count"`
+	// Memory size in GB
+	RamCapacity string `json:"ram_capacity"`
+	// Response message. This parameter is not returned if no abnormality occurs.
+	ErrorMsg string `json:"error_msg,omitempty"`
+	// Project ID
+	ProjectId string `json:"project_id"`
+	// The function has not been supported, and this field is reserved.
+	OrderId string `json:"order_id"`
+	// Engine version (core instance version)
+	EngineVersion string `json:"engine_version"`
+	// Node information
+	Nodes []GetDetailfNodesInfo `json:"nodes"`
+	// Username of the administrator. The username: Can include 1 to 32 characters. Must start with a letter. Can contain only letters, digits, and underscores (_).
+	AdminUserName string `json:"admin_user_name"`
+}
+
+type GetDetailfNodesInfo struct {
+	// Status of the DDM instance node. For details, see Status Description at
+	// https://docs.otc.t-systems.com/distributed-database-middleware/api-ref/appendix/status_description.html
+	Status string `json:"status"`
+	// Port of the DDM instance node
+	Port string `json:"port"`
+	// IP address of the DDM instance node
+	IP string `json:"ip"`
+}