diff --git a/index.html b/index.html
index f127c07..fdc2472 100644
--- a/index.html
+++ b/index.html
@@ -179,14 +179,15 @@
                 </div>
             </div>
 
-            <!-- 模块4：渠道效率指标表 -->
+            <!-- 模块4：渠道效率对比（按 产品_国家 分组，展开各渠道）-->
             <div class="section">
-                <h2>渠道效率对比</h2>
+                <h2>渠道效率对比（产品_国家 × 渠道）</h2>
+                <p class="hint">每个产品_国家下列出其投放过的各渠道及效率指标，同组内可横向对比不同渠道表现。</p>
                 <div class="table-wrapper">
                     <table id="channelTable">
                         <thead>
                             <tr>
-                                <th>渠道</th><th>展示</th><th>点击</th><th>转化</th>
+                                <th>产品_国家</th><th>渠道</th><th>展示</th><th>点击</th><th>转化</th>
                                 <th>花费</th><th>CTR</th><th>CVR</th><th>eCPM</th><th>CPC</th><th>CPA</th>
                             </tr>
                         </thead>
@@ -446,17 +447,36 @@
             options:{ responsive:true, maintainAspectRatio:false, plugins:{legend:{position:'right',labels:{boxWidth:12,font:{size:11}}}} }
         });
 
-        // ---- 模块4：渠道效率表 ----
-        document.querySelector('#channelTable tbody').innerHTML = chans.map(c => {
-            const cm = metrics(data.filter(x=>x.channel===c));
-            return `<tr>
-                <td><span class="tag" style="background:${(CH_COLORS[c]||'#999')}20;color:${CH_COLORS[c]||'#666'}">${c}</span></td>
-                <td class="num">${fmtNum(cm.imp)}</td><td class="num">${fmtNum(cm.clk)}</td><td class="num">${cm.cv}</td>
-                <td class="num">${fmtMoney(cm.sp)}</td><td class="num">${(cm.ctr*100).toFixed(2)}%</td>
-                <td class="num">${(cm.cvr*100).toFixed(2)}%</td><td class="num">$${cm.ecpm.toFixed(2)}</td>
-                <td class="num">$${cm.cpc.toFixed(3)}</td><td class="num">${cm.cpa?fmtMoney(cm.cpa):'-'}</td>
-            </tr>`;
-        }).join('') || `<tr><td colspan="10" class="empty">暂无数据</td></tr>`;
+        // ---- 模块4：渠道效率对比（按 产品_国家 分组，展开各渠道）----
+        // 分组键 = 产品 + 国家
+        const groupMap = {};
+        data.forEach(x => {
+            const g = x.product + '_' + x.location;
+            (groupMap[g] = groupMap[g] || []).push(x);
+        });
+        // 分组按总展示降序；组内渠道也按展示降序
+        const groupKeys = Object.keys(groupMap).sort((a,b)=> sum(groupMap[b],'impression') - sum(groupMap[a],'impression'));
+        let rowsHtml = '';
+        groupKeys.forEach(g => {
+            const rows = groupMap[g];
+            const chansInG = [...new Set(rows.map(x=>x.channel))]
+                .sort((a,b)=> sum(rows.filter(x=>x.channel===b),'impression') - sum(rows.filter(x=>x.channel===a),'impression'));
+            chansInG.forEach((c, idx) => {
+                const cm = metrics(rows.filter(x=>x.channel===c));
+                const groupCell = idx===0
+                    ? `<td rowspan="${chansInG.length}" style="font-weight:600;vertical-align:top;background:#fafbfc;">${g}</td>`
+                    : '';
+                rowsHtml += `<tr>
+                    ${groupCell}
+                    <td><span class="tag" style="background:${(CH_COLORS[c]||'#999')}20;color:${CH_COLORS[c]||'#666'}">${c}</span></td>
+                    <td class="num">${fmtNum(cm.imp)}</td><td class="num">${fmtNum(cm.clk)}</td><td class="num">${cm.cv}</td>
+                    <td class="num">${fmtMoney(cm.sp)}</td><td class="num">${(cm.ctr*100).toFixed(2)}%</td>
+                    <td class="num">${(cm.cvr*100).toFixed(2)}%</td><td class="num">$${cm.ecpm.toFixed(2)}</td>
+                    <td class="num">$${cm.cpc.toFixed(3)}</td><td class="num">${cm.cpa?fmtMoney(cm.cpa):'-'}</td>
+                </tr>`;
+            });
+        });
+        document.querySelector('#channelTable tbody').innerHTML = rowsHtml || `<tr><td colspan="11" class="empty">暂无数据</td></tr>`;
 
         // ---- 模块5：产品表现排行（按花费降序）----
         const prods = [...new Set(data.map(d=>d.product))];