diff --git a/frontend/src/views/login/index.vue b/frontend/src/views/login/index.vue
index d40c0e45..85ee42e6 100644
--- a/frontend/src/views/login/index.vue
+++ b/frontend/src/views/login/index.vue
@@ -24,7 +24,7 @@
           }}</span>
         </div>
         <div v-if="appearanceStore.getShowSlogan" class="welcome">
-          {{ appearanceStore.slogan || $t('common.intelligent_questioning_platform') }}
+          {{ appearanceStore.slogan ?? $t('common.intelligent_questioning_platform') }}
         </div>
         <div v-else class="welcome" style="height: 0"></div>
         <div class="login-form">
diff --git a/frontend/src/views/system/appearance/LoginPreview.vue b/frontend/src/views/system/appearance/LoginPreview.vue
index 7e2ba2d7..17ecb744 100644
--- a/frontend/src/views/system/appearance/LoginPreview.vue
+++ b/frontend/src/views/system/appearance/LoginPreview.vue
@@ -52,7 +52,7 @@
               </div>
             </div>
             <div v-if="isBtnShow(showSlogan)" class="login-welcome">
-              {{ pageSlogan || t('system.available_to_everyone') }}
+              {{ pageSlogan ?? t('common.intelligent_questioning_platform') }}
             </div>
             <div v-else class="login-welcome"></div>
           </div>