diff --git a/frontend/src/pages/admin/agent-apps/[id].vue b/frontend/src/pages/admin/agent-apps/[id].vue
index b02780b..cbace2f 100644
--- a/frontend/src/pages/admin/agent-apps/[id].vue
+++ b/frontend/src/pages/admin/agent-apps/[id].vue
@@ -269,16 +269,16 @@ onMounted(() => {
               </div>
 
               <div class="space-y-2">
-                <UiLabel>{{ t('admin.agentApps.createForm.cardPermission') }} <span class="text-destructive">*</span></UiLabel>
+                <UiLabel>{{ t('admin.agentApps.createForm.selectCardType') }} <span class="text-destructive">*</span></UiLabel>
                 <div class="flex gap-3">
                   <div class="flex-1">
                     <UiSelect v-model="selectedCardTypeId" :disabled="!form.application_id || saving">
                       <UiSelectTrigger>
-                        <UiSelectValue :placeholder="t('admin.agentApps.createForm.selectCardType')" />
+                        <UiSelectValue :placeholder="t('admin.agentApps.createForm.selectCardTypePlaceholder')" />
                       </UiSelectTrigger>
                       <UiSelectContent>
                         <UiSelectItem v-for="ct in availableCardTypes" :key="ct.id" :value="String(ct.id)">
-                          {{ ct.name }} ({{ ct.billing_type }})
+                          {{ ct.name }}<template v-if="ct.billing_type"> ({{ ct.billing_type }})</template>
                         </UiSelectItem>
                       </UiSelectContent>
                     </UiSelect>
@@ -293,7 +293,7 @@ onMounted(() => {
                   <div v-for="(p, index) in permissions" :key="p.card_type_id" class="flex items-center justify-between p-3 gap-4">
                     <div class="flex-1 min-w-0">
                       <div class="font-medium truncate">{{ p.card_type_name }}</div>
-                      <div class="text-sm text-muted-foreground">{{ p.billing_type }}</div>
+                      <div v-if="p.billing_type" class="text-sm text-muted-foreground">{{ p.billing_type }}</div>
                     </div>
                     <div class="flex items-center gap-2 shrink-0">
                       <div class="flex items-center gap-1">
diff --git a/frontend/src/pages/admin/agent-apps/create.vue b/frontend/src/pages/admin/agent-apps/create.vue
index 83040c7..d95b225 100644
--- a/frontend/src/pages/admin/agent-apps/create.vue
+++ b/frontend/src/pages/admin/agent-apps/create.vue
@@ -232,16 +232,16 @@ onMounted(() => {
               </div>
 
               <div class="space-y-2">
-                <UiLabel>{{ t('admin.agentApps.createForm.cardPermission') }} <span class="text-destructive">*</span></UiLabel>
+                <UiLabel>{{ t('admin.agentApps.createForm.selectCardType') }} <span class="text-destructive">*</span></UiLabel>
                 <div class="flex gap-3">
                   <div class="flex-1">
                     <UiSelect v-model="selectedCardTypeId" :disabled="!form.application_id || saving">
                       <UiSelectTrigger>
-                        <UiSelectValue :placeholder="t('admin.agentApps.createForm.selectCardType')" />
+                        <UiSelectValue :placeholder="t('admin.agentApps.createForm.selectCardTypePlaceholder')" />
                       </UiSelectTrigger>
                       <UiSelectContent>
                         <UiSelectItem v-for="ct in availableCardTypes" :key="ct.id" :value="String(ct.id)">
-                          {{ ct.name }} ({{ ct.billing_type }})
+                          {{ ct.name }}<template v-if="ct.billing_type"> ({{ ct.billing_type }})</template>
                         </UiSelectItem>
                       </UiSelectContent>
                     </UiSelect>
@@ -256,7 +256,7 @@ onMounted(() => {
                   <div v-for="(p, index) in permissions" :key="p.card_type_id" class="flex items-center justify-between p-3 gap-4">
                     <div class="flex-1 min-w-0">
                       <div class="font-medium truncate">{{ p.card_type_name }}</div>
-                      <div class="text-sm text-muted-foreground">{{ p.billing_type }}</div>
+                      <div v-if="p.billing_type" class="text-sm text-muted-foreground">{{ p.billing_type }}</div>
                     </div>
                     <div class="flex items-center gap-2 shrink-0">
                       <div class="flex items-center gap-1">
diff --git a/frontend/src/plugins/i18n/en.json b/frontend/src/plugins/i18n/en.json
index 6a927a2..e62b1cf 100644
--- a/frontend/src/plugins/i18n/en.json
+++ b/frontend/src/plugins/i18n/en.json
@@ -1717,6 +1717,7 @@
         "selectAppPlaceholder": "Please select an application",
         "cardPermission": "Card Type Permissions",
         "selectCardType": "Select Card Type",
+        "selectCardTypePlaceholder": "Please select a card type",
         "addCardType": "Add",
         "cardTypeList": "Authorized Card Types",
         "cardTypeName": "Card Type Name",
diff --git a/frontend/src/plugins/i18n/zh.json b/frontend/src/plugins/i18n/zh.json
index 3e103e7..ded9cfa 100644
--- a/frontend/src/plugins/i18n/zh.json
+++ b/frontend/src/plugins/i18n/zh.json
@@ -1706,6 +1706,7 @@
         "selectAppPlaceholder": "请选择应用",
         "cardPermission": "卡类权限",
         "selectCardType": "选择卡类",
+        "selectCardTypePlaceholder": "请选择卡类",
         "addCardType": "添加",
         "cardTypeList": "已授权卡类",
         "cardTypeName": "卡类名称",