diff --git a/回报率预测计算器.html b/回报率预测计算器.html
index 4eb65e3..9f76538 100644
--- a/回报率预测计算器.html
+++ b/回报率预测计算器.html
@@ -159,7 +159,7 @@
             <div class="summary-card">
                 <h2>投资回收期</h2>
                 <div id="paybackPeriod" class="summary-value">54.5 个月</div>
-                <p class="note">= 单站总投资 / 月净利润</p>
+                <p class="note">= 总投资 / 月净利润</p>
             </div>
             <div class="summary-card">
                 <h2>年化 ROI</h2>
@@ -183,6 +183,10 @@
                     月计费天数 (天)
                     <input id="daysPerMonth" type="number" min="1" step="1" value="30" />
                 </label>
+                <label>
+                    运营站点数量 (个)
+                    <input id="siteCount" type="number" min="1" step="1" value="1" />
+                </label>
                 <label>
                     废纸板回收价 ¥/公斤 (给用户)
                     <input id="buyPriceCardboard" type="number" min="0" step="0.01" value="0.8" />
@@ -206,8 +210,8 @@
             <h3>运营及投入假设</h3>
             <div class="field-grid">
                 <label>
-                    场地合作分成 (占给站长回收金 %)
-                    <input id="siteFeePercent" type="number" min="0" step="0.1" value="10" />
+                    场地合作分成 (占销售总收入 %)
+                    <input id="siteFeePercent" type="number" min="0" step="0.1" value="6.8" />
                 </label>
                 <label>
                     月物流清运成本 (¥)
@@ -311,7 +315,7 @@
                 </thead>
                 <tbody>
                     <tr>
-                        <td>单站总投资 (Capex)</td>
+                        <td>总投资 (Capex)</td>
                         <td id="totalInvestment">¥ 1,800.00</td>
                     </tr>
                     <tr>
@@ -355,6 +359,7 @@
             const dailyCardboard = getValue("dailyCardboard");
             const dailyPet = getValue("dailyPet");
             const days = getValue("daysPerMonth");
+            const siteCount = Math.max(getValue("siteCount"), 0);
 
             const buyCardboard = getValue("buyPriceCardboard");
             const sellCardboard = getValue("sellPriceCardboard");
@@ -368,8 +373,8 @@
             const equipmentCost = getValue("equipmentCost");
             const deploymentCost = getValue("deploymentCost");
 
-            const monthlyCardboardKg = dailyCardboard * days;
-            const monthlyPetKg = dailyPet * days;
+            const monthlyCardboardKg = dailyCardboard * days * siteCount;
+            const monthlyPetKg = dailyPet * days * siteCount;
             const monthlyTotalKg = monthlyCardboardKg + monthlyPetKg;
 
             const payoutCardboard = monthlyCardboardKg * buyCardboard;
@@ -384,11 +389,15 @@
             const grossPet = salePet - payoutPet;
             const grossTotal = grossCardboard + grossPet;
 
-            const siteFee = payoutTotal * siteFeePercent;
-            const fixedCostTotal = siteFee + logisticsCost + maintenanceCost + otherCost;
+            const logisticsCostTotal = logisticsCost * siteCount;
+            const maintenanceCostTotal = maintenanceCost * siteCount;
+            const otherCostTotal = otherCost * siteCount;
+            const siteFee = saleTotal * siteFeePercent;
+            const fixedCostTotal = siteFee + logisticsCostTotal + maintenanceCostTotal + otherCostTotal;
             const monthlyNetProfit = grossTotal - fixedCostTotal;
 
-            const totalInvestment = equipmentCost + deploymentCost;
+            const totalInvestmentPerSite = equipmentCost + deploymentCost;
+            const totalInvestment = totalInvestmentPerSite * siteCount;
             const annualNetProfit = monthlyNetProfit * 12;
 
             const paybackMonths = monthlyNetProfit > 0 ? totalInvestment / monthlyNetProfit : Infinity;
@@ -412,9 +421,9 @@
             document.getElementById("grossTotal").textContent = formatCurrency(grossTotal);
 
             document.getElementById("siteFee").textContent = formatCurrency(siteFee);
-            document.getElementById("logisticsCostCell").textContent = formatCurrency(logisticsCost);
-            document.getElementById("maintenanceCostCell").textContent = formatCurrency(maintenanceCost);
-            document.getElementById("otherCostCell").textContent = formatCurrency(otherCost);
+            document.getElementById("logisticsCostCell").textContent = formatCurrency(logisticsCostTotal);
+            document.getElementById("maintenanceCostCell").textContent = formatCurrency(maintenanceCostTotal);
+            document.getElementById("otherCostCell").textContent = formatCurrency(otherCostTotal);
             document.getElementById("fixedCostTotal").innerHTML = `<strong>${formatCurrency(fixedCostTotal)}</strong>`;
 
             document.getElementById("totalInvestment").textContent = formatCurrency(totalInvestment);