diff --git a/manual_trading_hub/static/chart.js b/manual_trading_hub/static/chart.js
index 8cf270f..5af58be 100644
--- a/manual_trading_hub/static/chart.js
+++ b/manual_trading_hub/static/chart.js
@@ -1,5 +1,5 @@
 /**
- * 中控行情区：K 线 + 成交量；Hub 后台轮询 + SSE 推送；价格轴「自动」。
+ * 中控行情区：K 线 + 成交量；Hub 后台轮询 + SSE 推送；「自动」控制价格轴与视口跟随。
  */
 (function () {
   const AUTO_REFRESH_MS = 5000;
@@ -2255,22 +2255,27 @@
           applyChartPriceFormat();
         }
       }
+      const autoFollow = priceAutoScale;
       const shouldPreserve =
         savedRange &&
         isVisibleRangeValidForCandles(savedRange, candleCountBefore) &&
-        (chartRangeUserLocked || !wasViewingTail);
+        (!autoFollow || chartRangeUserLocked || !wasViewingTail);
       applyCandlesToChart(
         mergeCandles(lastCandles, alignCandlesToTick(data.candles), { prepend: false }),
         0,
         {
           preserveRange: !!shouldPreserve,
-          skipAutoScale: chartRangeUserLocked,
+          skipAutoScale: !autoFollow,
         }
       );
       if (epochAtStart !== chartViewEpoch) return;
       const n = lastCandles.length;
       const minorTailUpdate = Math.abs(n - candleCountBefore) <= CHART_TAIL_REFRESH_LIMIT + 5;
-      if (wasViewingTail && !chartRangeUserLocked) {
+      if (!autoFollow) {
+        if (savedRange && isVisibleRangeValidForCandles(savedRange, n)) {
+          restoreVisibleLogicalRange(savedRange, n);
+        }
+      } else if (wasViewingTail && !chartRangeUserLocked) {
         restoreVisibleLogicalRange(tailVisibleLogicalRange(n), n);
       } else if (shouldPreserve && minorTailUpdate) {
         if (!restoreVisibleLogicalRange(savedRange, n) && !chartRangeUserLocked) {
@@ -2659,6 +2664,7 @@
       elPriceAuto.addEventListener("click", function () {
         priceAutoScale = !priceAutoScale;
         applyPriceAutoScale();
+        if (priceAutoScale) applyDefaultVisibleRange();
       });
     }
     if (elPosClear) {
diff --git a/manual_trading_hub/static/index.html b/manual_trading_hub/static/index.html
index a415ddd..e28a80b 100644
--- a/manual_trading_hub/static/index.html
+++ b/manual_trading_hub/static/index.html
@@ -179,7 +179,7 @@
             </div>
             <div id="market-price-tag-time" class="market-price-tag-time"></div>
           </div>
-          <button type="button" id="market-price-auto" class="market-price-auto is-on" title="价格轴自动缩放">自动</button>
+          <button type="button" id="market-price-auto" class="market-price-auto is-on" title="开启：价格轴与视口随刷新自动调整；关闭：后台静默更新，保留当前缩放">自动</button>
         </div>
       </div>
     </div>