diff --git a/packages/gui/src/view/pages/server.vue b/packages/gui/src/view/pages/server.vue
index cc68cae..db49d97 100644
--- a/packages/gui/src/view/pages/server.vue
+++ b/packages/gui/src/view/pages/server.vue
@@ -200,8 +200,8 @@
                     <a-icon v-else type="info-circle"/>
                   </a>
                   <a-tag style="margin:2px;" v-for="(element,index) of item.backupList" :title="element.dns"
-                         :color="element.time?'green':'red'" :key='index'>{{ element.host }}
-                    {{ element.time }}{{ element.time ? 'ms' : '' }}
+                         :color="element.time?'green':'red'" :key='index'>
+                    {{ element.host }} {{ element.time }}{{ element.time ? 'ms' : '' }} {{ element.dns }}
                   </a-tag>
                 </a-card>
               </a-col>
diff --git a/packages/mitmproxy/src/lib/speed/SpeedTester.js b/packages/mitmproxy/src/lib/speed/SpeedTester.js
index a93ca58..8fcc1e7 100644
--- a/packages/mitmproxy/src/lib/speed/SpeedTester.js
+++ b/packages/mitmproxy/src/lib/speed/SpeedTester.js
@@ -111,7 +111,18 @@ class SpeedTester {
       _.merge(item, ret)
       aliveList.push({ ...ret, ...item })
       aliveList.sort((a, b) => a.time - b.time)
-      this.backupList.sort((a, b) => a.time - b.time)
+      this.backupList.sort((a, b) => {
+        if (a.time === b.time) {
+          return 0
+        }
+        if (a.time == null) {
+          return 1
+        }
+        if (b.time == null) {
+          return -1
+        }
+        return a.time - b.time
+      })
     } catch (e) {
       if (e.message !== 'timeout') {
         log.warn('[speed] test error:  ', this.hostname, `➜ ${item.host}:${item.port} from DNS '${item.dns}'`, ', errorMsg:', e.message)