diff --git a/static/js/market.js b/static/js/market.js
index e8c95e4..d524129 100644
--- a/static/js/market.js
+++ b/static/js/market.js
@@ -26,6 +26,8 @@
     var followingLatest = true;
     var autoFollow = true;
     var DEFAULT_VISIBLE_BARS = 80;
+    var EMA_STORAGE_KEY = 'qihuo-market-ema-periods';
+    var DEFAULT_EMA = { fast: 21, slow: 55 };
 
     var PERIOD_SECONDS = {
         timeshare: 60,
@@ -138,13 +140,75 @@
         return out;
     }
 
-    function calcMA(period, bars) {
+    function clampEmaPeriod(v, fallback) {
+        var n = parseInt(v, 10);
+        if (isNaN(n)) return fallback;
+        return Math.max(2, Math.min(500, n));
+    }
+
+    function loadEmaPeriodsFromStorage() {
+        try {
+            var raw = localStorage.getItem(EMA_STORAGE_KEY);
+            if (raw) {
+                var o = JSON.parse(raw);
+                return {
+                    fast: clampEmaPeriod(o.fast, DEFAULT_EMA.fast),
+                    slow: clampEmaPeriod(o.slow, DEFAULT_EMA.slow),
+                };
+            }
+        } catch (e) { /* ignore */ }
+        return { fast: DEFAULT_EMA.fast, slow: DEFAULT_EMA.slow };
+    }
+
+    function saveEmaPeriods(fast, slow) {
+        try {
+            localStorage.setItem(EMA_STORAGE_KEY, JSON.stringify({ fast: fast, slow: slow }));
+        } catch (e) { /* ignore */ }
+    }
+
+    function getEmaPeriods() {
+        var fastEl = document.getElementById('chart-ema-fast');
+        var slowEl = document.getElementById('chart-ema-slow');
+        var fast = clampEmaPeriod(fastEl && fastEl.value, DEFAULT_EMA.fast);
+        var slow = clampEmaPeriod(slowEl && slowEl.value, DEFAULT_EMA.slow);
+        if (fastEl) fastEl.value = String(fast);
+        if (slowEl) slowEl.value = String(slow);
+        return { fast: fast, slow: slow };
+    }
+
+    function syncEmaInputsEnabled() {
+        var fastEl = document.getElementById('chart-ema-fast');
+        var slowEl = document.getElementById('chart-ema-slow');
+        var on = !!chartOpts.ma;
+        if (fastEl) fastEl.disabled = !on;
+        if (slowEl) slowEl.disabled = !on;
+    }
+
+    function initEmaPeriodInputs() {
+        var stored = loadEmaPeriodsFromStorage();
+        var fastEl = document.getElementById('chart-ema-fast');
+        var slowEl = document.getElementById('chart-ema-slow');
+        if (fastEl) fastEl.value = String(stored.fast);
+        if (slowEl) slowEl.value = String(stored.slow);
+        syncEmaInputsEnabled();
+    }
+
+    function calcEMA(period, bars) {
         var result = [];
+        if (!bars.length || period < 1) return result;
+        var k = 2 / (period + 1);
+        var ema = null;
         for (var i = 0; i < bars.length; i++) {
-            if (i < period - 1) continue;
-            var sum = 0;
-            for (var j = 0; j < period; j++) sum += bars[i - j].close;
-            result.push({ time: bars[i].time, value: +(sum / period).toFixed(4) });
+            var close = bars[i].close;
+            if (ema == null) {
+                if (i < period - 1) continue;
+                var sum = 0;
+                for (var j = i - period + 1; j <= i; j++) sum += bars[j].close;
+                ema = sum / period;
+            } else {
+                ema = close * k + ema * (1 - k);
+            }
+            result.push({ time: bars[i].time, value: +ema.toFixed(4) });
         }
         return result;
     }
@@ -340,10 +404,11 @@
             color: up ? c.up : c.down,
         });
         if (chartOpts.ma && ma21Series && ma55Series && prepared && prepared.length) {
-            var ma21 = calcMA(21, prepared);
-            var ma55 = calcMA(55, prepared);
-            if (ma21.length) ma21Series.update(ma21[ma21.length - 1]);
-            if (ma55.length) ma55Series.update(ma55[ma55.length - 1]);
+            var emaP = getEmaPeriods();
+            var emaFast = calcEMA(emaP.fast, prepared);
+            var emaSlow = calcEMA(emaP.slow, prepared);
+            if (emaFast.length) ma21Series.update(emaFast[emaFast.length - 1]);
+            if (emaSlow.length) ma55Series.update(emaSlow[emaSlow.length - 1]);
         }
     }
 
@@ -386,8 +451,9 @@
                 };
             }));
             if (chartOpts.ma && ma21Series && ma55Series) {
-                ma21Series.setData(calcMA(21, prepared));
-                ma55Series.setData(calcMA(55, prepared));
+                var emaP = getEmaPeriods();
+                ma21Series.setData(calcEMA(emaP.fast, prepared));
+                ma55Series.setData(calcEMA(emaP.slow, prepared));
             }
             applyPrevCloseLine(lastPrevClose != null ? lastPrevClose : data.prev_close);
         }
@@ -663,6 +729,17 @@
         var prevCb = document.getElementById('chart-opt-prev-close');
         var maCb = document.getElementById('chart-opt-ma');
         var gapCb = document.getElementById('chart-opt-gap-day');
+        var emaFastEl = document.getElementById('chart-ema-fast');
+        var emaSlowEl = document.getElementById('chart-ema-slow');
+
+        function onEmaPeriodChange() {
+            var emaP = getEmaPeriods();
+            saveEmaPeriods(emaP.fast, emaP.slow);
+            if (chartOpts.ma && lastData) {
+                renderChart(lastData, { forceFull: true });
+            }
+        }
+
         if (prevCb) {
             prevCb.addEventListener('change', function () {
                 chartOpts.prevClose = prevCb.checked;
@@ -674,12 +751,33 @@
         if (maCb) {
             maCb.addEventListener('change', function () {
                 chartOpts.ma = maCb.checked;
+                syncEmaInputsEnabled();
                 if (lastData) {
                     destroyChart();
                     renderChart(lastData, { forceFull: true });
                 }
             });
         }
+        if (emaFastEl) {
+            emaFastEl.addEventListener('change', onEmaPeriodChange);
+            emaFastEl.addEventListener('keydown', function (ev) {
+                if (ev.key === 'Enter') {
+                    ev.preventDefault();
+                    emaFastEl.blur();
+                    onEmaPeriodChange();
+                }
+            });
+        }
+        if (emaSlowEl) {
+            emaSlowEl.addEventListener('change', onEmaPeriodChange);
+            emaSlowEl.addEventListener('keydown', function (ev) {
+                if (ev.key === 'Enter') {
+                    ev.preventDefault();
+                    emaSlowEl.blur();
+                    onEmaPeriodChange();
+                }
+            });
+        }
         if (gapCb) {
             gapCb.addEventListener('change', function () {
                 chartOpts.gapDay = gapCb.checked;
@@ -702,6 +800,7 @@
         bindPeriodTabs();
         bindZoomButtons();
         bindAutoButton();
+        initEmaPeriodInputs();
         bindChartOptions();
 
         var active = document.querySelector('.period-tab.active');
diff --git a/templates/market.html b/templates/market.html
index 59abf9e..45d3ab7 100644
--- a/templates/market.html
+++ b/templates/market.html
@@ -31,7 +31,12 @@
     <div class="market-chart-toolbar">
         <div class="market-chart-options">
             <label class="chart-opt"><input type="checkbox" id="chart-opt-prev-close">昨收线</label>
-            <label class="chart-opt"><input type="checkbox" id="chart-opt-ma">均线 21/55</label>
+            <label class="chart-opt"><input type="checkbox" id="chart-opt-ma">EMA</label>
+            <span class="chart-ema-periods" id="chart-ema-periods">
+                <input type="number" class="chart-ema-input" id="chart-ema-fast" value="21" min="2" max="500" step="1" title="快线周期" aria-label="EMA快线周期">
+                <span class="chart-ema-sep">/</span>
+                <input type="number" class="chart-ema-input" id="chart-ema-slow" value="55" min="2" max="500" step="1" title="慢线周期" aria-label="EMA慢线周期">
+            </span>
             <label class="chart-opt"><input type="checkbox" id="chart-opt-gap-day">间隔日</label>
         </div>
         <div class="market-chart-zoom">
@@ -97,6 +102,14 @@
     color:var(--text-muted);cursor:pointer;user-select:none;
 }
 .chart-opt input{width:auto;margin:0;cursor:pointer}
+.chart-ema-periods{display:flex;align-items:center;gap:.25rem;font-size:.78rem;color:var(--text-muted)}
+.chart-ema-input{
+    width:3.1rem;padding:.28rem .35rem;border-radius:6px;
+    border:1px solid var(--input-border);background:var(--toggle-bg);
+    color:var(--text-primary);font-size:.78rem;font-variant-numeric:tabular-nums;
+}
+.chart-ema-input:disabled{opacity:.45;cursor:not-allowed}
+.chart-ema-sep{opacity:.6}
 .market-chart-zoom{display:flex;gap:.35rem;align-items:center}
 .chart-zoom-btn{
     width:32px;height:32px;padding:0;border-radius:8px;