diff --git a/src/i18n/locales/en-US.ts b/src/i18n/locales/en-US.ts
index 93df6870..c47e459f 100644
--- a/src/i18n/locales/en-US.ts
+++ b/src/i18n/locales/en-US.ts
@@ -1319,5 +1319,12 @@ export default {
         noChange: "No change in interface settings",
       },
     },
+    tool: {
+      help: {
+        download: "Download",
+        pdfViewer: "In-browser preview",
+        pdfViewerErr: "Sorry, your browser does not support PDF preview!",
+      }
+    },
   },
 };
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index 02ef0078..5c106a0a 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -495,7 +495,6 @@ export default {
       },
       sub: {
         subInfo:'签约信息',
-        neTypePlease: '查询网元类型',
         neType: 'UDM网元类型',
         export: '导出',
         exportConfirm: '确认导出全部签约用户数据吗?',
@@ -530,15 +529,12 @@ export default {
         ardTip:'接入控制标志(Access-Restriction-Data),可用于区分2G/3G/LTE用户,便于为2G/3G/LTE网络共存时,对不同类型用户进行区分服务',
       },
       base5G: {
-        neTypePlease: '查询网元类型',
         neType: 'AMF网元对象',
       },
       ue: {
-        neTypePlease: '查询网元类型',
         neType: 'SMF网元对象',
       },
       ims: {
-        neTypePlease: '查询网元类型',
         neType: 'IMS网元对象',
       },
     },
@@ -1323,5 +1319,12 @@ export default {
         noChange: "接口设置无变更",
       },
     },
+    tool: {
+      help: {
+        download: "下载",
+        pdfViewer: "浏览器内预览",
+        pdfViewerErr: "很抱歉，您的浏览器不支持 PDF 预览！",
+      }
+    },
   },
 };
diff --git a/src/views/tool/help/index.vue b/src/views/tool/help/index.vue
index 08a7079a..7fd32d5c 100644
--- a/src/views/tool/help/index.vue
+++ b/src/views/tool/help/index.vue
@@ -79,7 +79,13 @@ function fnDownload() {
 
 /**系统使用手册跳转 */
 function fnClickHelpDoc() {
-  window.open(docUrl.value, '_blank');
+  // 浏览器支持 PDF 预览
+  if (navigator.pdfViewerEnabled) {
+    window.open(docUrl.value, '_blank');
+  } else {
+    // 浏览器不支持 PDF 预览
+    alert(t('views.tool.help.pdfViewerErr'));
+  }
 }
 
 onMounted(() => {
@@ -104,11 +110,11 @@ onMounted(() => {
       <a-space :size="12" align="center">
         <a-button type="default" @click="fnClickHelpDoc()">
           <template #icon><ToTopOutlined /> </template>
-          浏览器内打开
+          {{ t('views.tool.help.pdfViewer') }}
         </a-button>
         <a-button type="primary" @click="fnDownload()">
           <template #icon><DownloadOutlined /></template>
-          下载
+          {{ t('views.tool.help.download') }}
         </a-button>
       </a-space>
     </a-col>
@@ -126,7 +132,9 @@ onMounted(() => {
     </a-col>
     <a-col :span="20" class="right">
       <div class="right-view">
+        <a-spin size="large" style="margin: 50%" v-if="pages === 0" />
         <VuePDF
+          v-else
           :pdf="pdf"
           :page="viewPage"
           :scale="viewScale"
@@ -134,7 +142,7 @@ onMounted(() => {
           :annotations-filter="['Link']"
           @annotation="fnAnnotation"
         >
-          <a-spin style="margin: 50%" />
+          <a-spin size="large" style="margin: 50%" />
         </VuePDF>
       </div>
     </a-col>