diff --git a/pkg/ui/v1alpha3/backend.go b/pkg/ui/v1alpha3/backend.go
index 3a6bd559471..41a9c955474 100644
--- a/pkg/ui/v1alpha3/backend.go
+++ b/pkg/ui/v1alpha3/backend.go
@@ -232,17 +232,13 @@ func (k *KatibUIHandler) DeleteTemplate(w http.ResponseWriter, r *http.Request)
 
 func (k *KatibUIHandler) FetchNamespaces(w http.ResponseWriter, r *http.Request) {
 
-	namespaceList, err := k.katibClient.GetNamespaceList()
+	// Get all available namespaces
+	namespaces, err := k.getAvailableNamespaces()
 	if err != nil {
-		log.Printf("GetNamespaceList failed: %v", err)
+		log.Printf("GetAvailableNamespaces failed: %v", err)
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
-	var namespaces []string
-
-	for _, namespace := range namespaceList.Items {
-		namespaces = append(namespaces, namespace.ObjectMeta.Name)
-	}
 
 	response, err := json.Marshal(namespaces)
 	if err != nil {
diff --git a/pkg/ui/v1alpha3/hp.go b/pkg/ui/v1alpha3/hp.go
index 18c6bfd4101..56cb81227a7 100644
--- a/pkg/ui/v1alpha3/hp.go
+++ b/pkg/ui/v1alpha3/hp.go
@@ -18,8 +18,12 @@ import (
 
 // FetchAllHPJobs gets experiments in all namespaces.
 func (k *KatibUIHandler) FetchAllHPJobs(w http.ResponseWriter, r *http.Request) {
-	// Use "" to get experiments in all namespaces.
-	jobs, err := k.getExperimentList("", JobTypeHP)
+	// At first, try to list experiments in cluster scope
+	jobs, err := k.getExperimentList([]string{""}, JobTypeHP)
+	if err != nil {
+		// If failed, just try to list experiments from own namespace
+		jobs, err = k.getExperimentList([]string{}, JobTypeHP)
+	}
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
diff --git a/pkg/ui/v1alpha3/nas.go b/pkg/ui/v1alpha3/nas.go
index 6ff6b52843a..9c68cc2131b 100644
--- a/pkg/ui/v1alpha3/nas.go
+++ b/pkg/ui/v1alpha3/nas.go
@@ -12,9 +12,12 @@ import (
 )
 
 func (k *KatibUIHandler) FetchAllNASJobs(w http.ResponseWriter, r *http.Request) {
-	//enableCors(&w)
-	// Use "" to get experiments in all namespaces.
-	jobs, err := k.getExperimentList("", JobTypeNAS)
+	// At first, try to list experiments in cluster scope
+	jobs, err := k.getExperimentList([]string{""}, JobTypeHP)
+	if err != nil {
+		// If failed, just try to list experiments from own namespace
+		jobs, err = k.getExperimentList([]string{}, JobTypeHP)
+	}
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
diff --git a/pkg/ui/v1alpha3/util.go b/pkg/ui/v1alpha3/util.go
index 4c6cbcadc73..04cc3c859f4 100644
--- a/pkg/ui/v1alpha3/util.go
+++ b/pkg/ui/v1alpha3/util.go
@@ -2,6 +2,7 @@ package v1alpha3
 
 import (
 	"encoding/json"
+	"github.com/kubeflow/katib/pkg/controller.v1alpha3/consts"
 	"log"
 	"net/http"
 	"strconv"
@@ -12,10 +13,10 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
-func (k *KatibUIHandler) getExperimentList(namespace string, typ JobType) ([]JobView, error) {
+func (k *KatibUIHandler) getExperimentList(namespace []string, typ JobType) ([]JobView, error) {
 	jobs := make([]JobView, 0)
 
-	el, err := k.katibClient.GetExperimentList(namespace)
+	el, err := k.katibClient.GetExperimentList(namespace...)
 	if err != nil {
 		log.Printf("GetExperimentList failed: %v", err)
 		return nil, err
@@ -50,16 +51,15 @@ func enableCors(w *http.ResponseWriter) {
 func (k *KatibUIHandler) getTrialTemplatesViewList() ([]TrialTemplatesView, error) {
 	trialTemplatesViewList := make([]TrialTemplatesView, 0)
 
-	// Get all namespaces
-	namespaceList, err := k.katibClient.GetNamespaceList()
+	// Get all available namespaces
+	namespaces, err := k.getAvailableNamespaces()
 	if err != nil {
-		log.Printf("GetNamespaceList failed: %v", err)
+		log.Printf("GetAvailableNamespaces failed: %v", err)
 		return nil, err
 	}
 
 	// Get Trial Template ConfigMap for each namespace
-	for _, namespace := range namespaceList.Items {
-		ns := namespace.ObjectMeta.Name
+	for _, ns := range namespaces {
 		trialTemplatesConfigMapList, err := k.katibClient.GetTrialTemplates(ns)
 		if err != nil {
 			log.Printf("GetTrialTemplates failed: %v", err)
@@ -72,6 +72,22 @@ func (k *KatibUIHandler) getTrialTemplatesViewList() ([]TrialTemplatesView, erro
 	}
 	return trialTemplatesViewList, nil
 }
+
+func (k *KatibUIHandler) getAvailableNamespaces() ([]string, error) {
+	var namespaces []string
+
+	namespaceList, err := k.katibClient.GetNamespaceList()
+	if err != nil {
+		namespaces = append(namespaces, consts.DefaultKatibNamespace)
+		return namespaces, nil
+	}
+	for _, ns := range namespaceList.Items {
+		namespaces = append(namespaces, ns.ObjectMeta.Name)
+	}
+
+	return namespaces, nil
+}
+
 func getTrialTemplatesView(templatesConfigMapList *apiv1.ConfigMapList) TrialTemplatesView {
 
 	trialTemplateView := TrialTemplatesView{