diff --git a/pkg/models/applications/applications.go b/pkg/models/applications/applications.go
index 80fb63528..a800ffd9d 100644
--- a/pkg/models/applications/applications.go
+++ b/pkg/models/applications/applications.go
@@ -40,8 +40,8 @@ import (
 type Application struct {
 	Name        string            `json:"name" description:"application name"`
 	RepoName    string            `json:"repoName" description:"repo name"`
-	Runtime     string            `json:"namespace" description:"namespace"`
-	RuntimeId   string            `json:"runtime_id" description:"runtime id"`
+	Runtime     string            `json:"namespace" description:"namespace name"`
+	RuntimeId   string            `json:"runtime_id" description:"It is the application runtime in OpenPitrix and represents k8s namespace by annotating the namespace"`
 	Version     string            `json:"version" description:"application version"`
 	VersionId   string            `json:"version_id" description:"application version id"`
 	Status      string            `json:"status" description:"application status"`
diff --git a/pkg/simple/client/openpitrix/applications.go b/pkg/simple/client/openpitrix/applications.go
index 71f86a0c0..1326ba54c 100644
--- a/pkg/simple/client/openpitrix/applications.go
+++ b/pkg/simple/client/openpitrix/applications.go
@@ -102,14 +102,14 @@ type repoList struct {
 }
 
 type CreateClusterRequest struct {
-	AppId     string `json:"app_id"`
-	VersionId string `json:"version_id"`
-	RuntimeId string `json:"runtime_id"`
-	Conf      string `json:"conf"`
+	AppId     string `json:"app_id" description:"ID of app to run in cluster, e.g. app-AA3A3y3zEgEM"`
+	VersionId string `json:"version_id" description:"app version, e.g. appv-154gXYx5RKRp"`
+	RuntimeId string `json:"runtime_id" description:"ID of runtime, e.g. runtime-wWwXL0LzWqEr"`
+	Conf      string `json:"conf" description:"conf a json string, include cpu, memory info of cluster"`
 }
 
 type DeleteClusterRequest struct {
-	ClusterId []string `json:"cluster_id"`
+	ClusterId []string `json:"cluster_id" description:"cluster ID"`
 }
 
 func GetAppInfo(appId string) (string, string, string, error) {