diff --git a/application/views/mobile_first/ch-pc.php b/application/views/mobile_first/ch-pc.php
index 873f2e50..384b0959 100644
--- a/application/views/mobile_first/ch-pc.php
+++ b/application/views/mobile_first/ch-pc.php
@@ -42,7 +42,7 @@
         })(window, document, 'script', 'dataLayer', 'GTM-T75N4LL');</script>
     <!-- End Google Tag Manager -->
 
-    <!-- Hotjar Tracking Code for https://www.chinahighlights.com/ 
+    <!-- Hotjar Tracking Code for https://www.chinahighlights.com/
     <script>
     (function(h,o,t,j,a,r){
         h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};
@@ -93,7 +93,7 @@
                                                                 id="china_yangtze_cruise_2021">Yangtze River Cruise</a></li>
                                 <li class="start-nav-item"><a href="/tour/expats-tours.htm"
                                         id="china_expats_tours_2021">China Expats Tours</a></li>
-                                
+
                             </ul>
                         </div>
                     </li>
@@ -602,20 +602,32 @@
     </div>
 
     <script>
-        (function (w, d, i) {
-            var navbar = d.getElementById(i);
-            var prevScrollpos = w.pageYOffset;
-            w.onscroll = function () {
-                var currentScrollPos = w.pageYOffset;
-                if (prevScrollpos > currentScrollPos) {
-                    navbar.style.top = '0';
-                } else {
-                    navbar.style.top = '-100px';
-                }
-                prevScrollpos = currentScrollPos;
-            }
-        })(window, document, 'header');
-    </script>
+    (function (w, d, i) {
+      function debounce(func, wait) {
+        let timeout;
+        return function() {
+          const context = this;
+          const args = arguments;
+          clearTimeout(timeout);
+          timeout = setTimeout(() => func.apply(context, args), wait);
+        };
+      }
+
+      var navbar = d.getElementById(i);
+      var prevScrollpos = w.pageYOffset;
+      w.onscroll = debounce(function () {
+        var currentScrollPos = w.pageYOffset;
+        if (Math.abs(currentScrollPos - prevScrollpos) > 5) { // 滚动阈值
+          if (prevScrollpos > currentScrollPos) {
+            navbar.style.top = '0';
+          } else {
+            navbar.style.top = '-100px';
+          }
+          prevScrollpos = currentScrollPos;
+        }
+      }, 25) // 防止快速滚动时频繁触发
+    })(window, document, 'header');
+  </script>
 
     <!--@PRODUCT-JS@-->
     <!--@ADDON-JS@-->
diff --git a/application/views/mobile_first/ch.php b/application/views/mobile_first/ch.php
index b32b70dc..3bac11da 100644
--- a/application/views/mobile_first/ch.php
+++ b/application/views/mobile_first/ch.php
@@ -34,7 +34,7 @@
     })(window, document, 'script', 'dataLayer', 'GTM-T75N4LL');</script>
   <!-- End Google Tag Manager -->
 
-  <!-- Hotjar Tracking Code for https://www.chinahighlights.com/ 
+  <!-- Hotjar Tracking Code for https://www.chinahighlights.com/
   <script>
     (function(h,o,t,j,a,r){
         h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};
@@ -593,17 +593,29 @@
 
   <script>
     (function (w, d, i) {
+      function debounce(func, wait) {
+        let timeout;
+        return function() {
+          const context = this;
+          const args = arguments;
+          clearTimeout(timeout);
+          timeout = setTimeout(() => func.apply(context, args), wait);
+        };
+      }
+
       var navbar = d.getElementById(i);
       var prevScrollpos = w.pageYOffset;
-      w.onscroll = function () {
+      w.onscroll = debounce(function () {
         var currentScrollPos = w.pageYOffset;
-        if (prevScrollpos > currentScrollPos) {
-          navbar.style.top = '0';
-        } else {
-          navbar.style.top = '-100px';
+        if (Math.abs(currentScrollPos - prevScrollpos) > 5) { // 滚动阈值
+          if (prevScrollpos > currentScrollPos) {
+            navbar.style.top = '0';
+          } else {
+            navbar.style.top = '-100px';
+          }
+          prevScrollpos = currentScrollPos;
         }
-        prevScrollpos = currentScrollPos;
-      }
+      }, 25) // 防止快速滚动时频繁触发
     })(window, document, 'header');
   </script>
   <script>/* memu js https://data.chinahighlights.com/js/mobile-menu.js */
@@ -673,8 +685,8 @@
     },
     "geo": {
       "@type": "GeoCoordinates",
-      "latitude": 25.241375,   
-      "longitude": 110.33852  
+      "latitude": 25.241375,
+      "longitude": 110.33852
     },
     "url": "https://www.chinahighlights.com/",
     "telephone": "+86 773 2831999",
diff --git a/application/views/mobile_first/gh-pc.php b/application/views/mobile_first/gh-pc.php
index 4b2614c8..12bf229f 100644
--- a/application/views/mobile_first/gh-pc.php
+++ b/application/views/mobile_first/gh-pc.php
@@ -215,11 +215,11 @@
             </aside>
             <div class="info_tm_button"><a href="/forms/tailormade?product_code=" id="create_my_trip_button_pc">Create
                     my trip</a>
-            </div>  
+            </div>
         </div>
         <!--PC正文 结束--><!--@ARTICLENEXT@-->
     </div>
-    
+
     <!--PC底部-->
 
     <div class="infotailor">
@@ -277,7 +277,7 @@
                                             height="100"></div>
                                     <h3>Ensure Your Satisfactory</h3>
                                     <ul class="infolist">
-                                        <li>The Top 20% nationwide guides at your service.</li> 
+                                        <li>The Top 20% nationwide guides at your service.</li>
                                         <li>20% more space on your group's transportation.</li>
                                         <li> 24/7 emergency support.</li>
                                     </ul>
@@ -420,20 +420,32 @@
     </div>
 
     <script>
-        (function (w, d, i) {
-            var navbar = d.getElementById(i);
-            var prevScrollpos = w.pageYOffset;
-            w.onscroll = function () {
-                var currentScrollPos = w.pageYOffset;
-                if (prevScrollpos > currentScrollPos) {
-                    navbar.style.top = '0';
-                } else {
-                    navbar.style.top = '-100px';
-                }
-                prevScrollpos = currentScrollPos;
-            }
-        })(window, document, 'header');
-    </script>
+    (function (w, d, i) {
+      function debounce(func, wait) {
+        let timeout;
+        return function() {
+          const context = this;
+          const args = arguments;
+          clearTimeout(timeout);
+          timeout = setTimeout(() => func.apply(context, args), wait);
+        };
+      }
+
+      var navbar = d.getElementById(i);
+      var prevScrollpos = w.pageYOffset;
+      w.onscroll = debounce(function () {
+        var currentScrollPos = w.pageYOffset;
+        if (Math.abs(currentScrollPos - prevScrollpos) > 5) { // 滚动阈值
+          if (prevScrollpos > currentScrollPos) {
+            navbar.style.top = '0';
+          } else {
+            navbar.style.top = '-100px';
+          }
+          prevScrollpos = currentScrollPos;
+        }
+      }, 25) // 防止快速滚动时频繁触发
+    })(window, document, 'header');
+  </script>
 
     <!--PC底部 结束-->
 
diff --git a/application/views/mobile_first/gh.php b/application/views/mobile_first/gh.php
index f085b966..e543c4d0 100644
--- a/application/views/mobile_first/gh.php
+++ b/application/views/mobile_first/gh.php
@@ -448,19 +448,31 @@
     }
   </script>
 
-  <script>
+<script>
     (function (w, d, i) {
+      function debounce(func, wait) {
+        let timeout;
+        return function() {
+          const context = this;
+          const args = arguments;
+          clearTimeout(timeout);
+          timeout = setTimeout(() => func.apply(context, args), wait);
+        };
+      }
+
       var navbar = d.getElementById(i);
       var prevScrollpos = w.pageYOffset;
-      w.onscroll = function () {
+      w.onscroll = debounce(function () {
         var currentScrollPos = w.pageYOffset;
-        if (prevScrollpos > currentScrollPos) {
-          navbar.style.top = '0';
-        } else {
-          navbar.style.top = '-100px';
+        if (Math.abs(currentScrollPos - prevScrollpos) > 5) { // 滚动阈值
+          if (prevScrollpos > currentScrollPos) {
+            navbar.style.top = '0';
+          } else {
+            navbar.style.top = '-100px';
+          }
+          prevScrollpos = currentScrollPos;
         }
-        prevScrollpos = currentScrollPos;
-      }
+      }, 25) // 防止快速滚动时频繁触发
     })(window, document, 'header');
   </script>
   <!--移动底部 结束-->