diff --git a/frontend/index.html b/frontend/index.html
index b233c2b..fd7a66a 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -479,10 +479,16 @@
                             <div class="card-header">
                                 <h3><i class="fas fa-chart-line"></i> 时间趋势分析</h3>
                                 <div class="chart-controls">
+                                    <select id="trendTypeSelect" class="chart-field-select">
+                                        <option value="all" selected>全部指标</option>
+                                        <option value="customer">客户数</option>
+                                        <option value="demand">需求数</option>
+                                        <option value="issue">反馈数</option>
+                                    </select>
                                     <select id="trendChartFieldSelect" class="chart-field-select">
-                                        <option value="month">按月统计</option>
+                                        <option value="day" selected>按天统计</option>
                                         <option value="week">按周统计</option>
-                                        <option value="day">按天统计</option>
+                                        <option value="month">按月统计</option>
                                     </select>
                                 </div>
                             </div>
diff --git a/frontend/js/main.js b/frontend/js/main.js
index 41341f2..388fae5 100644
--- a/frontend/js/main.js
+++ b/frontend/js/main.js
@@ -61,7 +61,7 @@ function canDelete() {
 }
 
 document.addEventListener("DOMContentLoaded", function () {
-  console.log("CRM System Main JS v4.0 Loaded - " + new Date().toLocaleString());
+  console.log("CRM System Main JS v4.5 Loaded - " + new Date().toLocaleString());
   // 登录守卫
   const token = localStorage.getItem("crmToken");
   if (!token && !window.location.pathname.endsWith("login.html")) {
@@ -1653,7 +1653,9 @@ document.addEventListener("DOMContentLoaded", function () {
 
     const ctx = canvas.getContext("2d");
     const trendType =
-      document.getElementById("trendTypeSelect")?.value || "customer";
+      document.getElementById("trendTypeSelect")?.value || "all";
+    const dateGrain =
+      document.getElementById("trendChartFieldSelect")?.value || "day";
 
     if (trendChartInstance) {
       trendChartInstance.destroy();
@@ -1663,11 +1665,23 @@ document.addEventListener("DOMContentLoaded", function () {
     const dateMap = {};
 
     customers.forEach((customer) => {
-      const dateStr = normalizeDateValue(customer.intendedProduct);
-      if (!dateStr) return;
+      const dateValue = normalizeDateValue(customer.intendedProduct);
+      if (!dateValue) return;
 
-      if (!dateMap[dateStr]) {
-        dateMap[dateStr] = {
+      let dateKey = dateValue;
+      if (dateGrain === "month") {
+        dateKey = dateValue.substring(0, 7); // YYYY-MM
+      } else if (dateGrain === "week") {
+        // Find Monday of that week
+        const d = new Date(dateValue);
+        const day = d.getDay();
+        const diff = d.getDate() - day + (day === 0 ? -6 : 1);
+        const monday = new Date(d.setDate(diff));
+        dateKey = monday.toISOString().split("T")[0] + " (周)";
+      }
+
+      if (!dateMap[dateKey]) {
+        dateMap[dateKey] = {
           customers: new Set(),
           demands: 0,
           issues: 0,
@@ -1676,16 +1690,20 @@ document.addEventListener("DOMContentLoaded", function () {
 
       // Count customers
       if (customer.customerName) {
-        dateMap[dateStr].customers.add(customer.customerName);
+        dateMap[dateKey].customers.add(customer.customerName);
       }
 
       // Count demands and issues based on type
       const type = (customer.type || "").toLowerCase();
       if (type.includes("需求")) {
-        dateMap[dateStr].demands++;
+        dateMap[dateKey].demands++;
       }
-      if (type.includes("问题") || type.includes("功能问题")) {
-        dateMap[dateStr].issues++;
+      if (
+        type.includes("问题") ||
+        type.includes("功能问题") ||
+        type.includes("反馈")
+      ) {
+        dateMap[dateKey].issues++;
       }
     });
 
@@ -1695,96 +1713,60 @@ document.addEventListener("DOMContentLoaded", function () {
     // Prepare datasets based on selected trend type
     const datasets = [];
 
+    const customerDataset = {
+      label: "客户数",
+      data: sortedDates.map((date) => dateMap[date].customers.size),
+      borderColor: "#FF6B35",
+      backgroundColor: "rgba(255, 107, 53, 0.1)",
+      borderWidth: 3,
+      pointRadius: 5,
+      pointHoverRadius: 7,
+      pointBackgroundColor: "#FF6B35",
+      pointBorderColor: "#fff",
+      pointBorderWidth: 2,
+      tension: 0.4,
+      fill: trendType === "customer",
+    };
+
+    const demandDataset = {
+      label: "需求数",
+      data: sortedDates.map((date) => dateMap[date].demands),
+      borderColor: "#4CAF50",
+      backgroundColor: "rgba(76, 175, 80, 0.1)",
+      borderWidth: 3,
+      pointRadius: 5,
+      pointHoverRadius: 7,
+      pointBackgroundColor: "#4CAF50",
+      pointBorderColor: "#fff",
+      pointBorderWidth: 2,
+      tension: 0.4,
+      fill: trendType === "demand",
+    };
+
+    const issueDataset = {
+      label: "反馈数",
+      data: sortedDates.map((date) => dateMap[date].issues),
+      borderColor: "#2196F3",
+      backgroundColor: "rgba(33, 150, 243, 0.1)",
+      borderWidth: 3,
+      pointRadius: 5,
+      pointHoverRadius: 7,
+      pointBackgroundColor: "#2196F3",
+      pointBorderColor: "#fff",
+      pointBorderWidth: 2,
+      tension: 0.4,
+      fill: trendType === "issue",
+    };
+
     if (trendType === "customer") {
-      datasets.push({
-        label: "客户数",
-        data: sortedDates.map((date) => dateMap[date].customers.size),
-        borderColor: "#FF6B35",
-        backgroundColor: "rgba(255, 107, 53, 0.1)",
-        borderWidth: 3,
-        pointRadius: 5,
-        pointHoverRadius: 7,
-        pointBackgroundColor: "#FF6B35",
-        pointBorderColor: "#fff",
-        pointBorderWidth: 2,
-        tension: 0.4,
-        fill: true,
-      });
+      datasets.push(customerDataset);
     } else if (trendType === "demand") {
-      datasets.push({
-        label: "需求数",
-        data: sortedDates.map((date) => dateMap[date].demands),
-        borderColor: "#4CAF50",
-        backgroundColor: "rgba(76, 175, 80, 0.1)",
-        borderWidth: 3,
-        pointRadius: 5,
-        pointHoverRadius: 7,
-        pointBackgroundColor: "#4CAF50",
-        pointBorderColor: "#fff",
-        pointBorderWidth: 2,
-        tension: 0.4,
-        fill: true,
-      });
+      datasets.push(demandDataset);
     } else if (trendType === "issue") {
-      datasets.push({
-        label: "问题数",
-        data: sortedDates.map((date) => dateMap[date].issues),
-        borderColor: "#F28C28",
-        backgroundColor: "rgba(242, 140, 40, 0.1)",
-        borderWidth: 3,
-        pointRadius: 5,
-        pointHoverRadius: 7,
-        pointBackgroundColor: "#F28C28",
-        pointBorderColor: "#fff",
-        pointBorderWidth: 2,
-        tension: 0.4,
-        fill: true,
-      });
-    } else if (trendType === "all") {
-      datasets.push(
-        {
-          label: "客户数",
-          data: sortedDates.map((date) => dateMap[date].customers.size),
-          borderColor: "#FF6B35",
-          backgroundColor: "rgba(255, 107, 53, 0.1)",
-          borderWidth: 3,
-          pointRadius: 5,
-          pointHoverRadius: 7,
-          pointBackgroundColor: "#FF6B35",
-          pointBorderColor: "#fff",
-          pointBorderWidth: 2,
-          tension: 0.4,
-          fill: false,
-        },
-        {
-          label: "需求数",
-          data: sortedDates.map((date) => dateMap[date].demands),
-          borderColor: "#4CAF50",
-          backgroundColor: "rgba(76, 175, 80, 0.1)",
-          borderWidth: 3,
-          pointRadius: 5,
-          pointHoverRadius: 7,
-          pointBackgroundColor: "#4CAF50",
-          pointBorderColor: "#fff",
-          pointBorderWidth: 2,
-          tension: 0.4,
-          fill: false,
-        },
-        {
-          label: "问题数",
-          data: sortedDates.map((date) => dateMap[date].issues),
-          borderColor: "#F28C28",
-          backgroundColor: "rgba(242, 140, 40, 0.1)",
-          borderWidth: 3,
-          pointRadius: 5,
-          pointHoverRadius: 7,
-          pointBackgroundColor: "#F28C28",
-          pointBorderColor: "#fff",
-          pointBorderWidth: 2,
-          tension: 0.4,
-          fill: false,
-        },
-      );
+      datasets.push(issueDataset);
+    } else {
+      // all
+      datasets.push(customerDataset, demandDataset, issueDataset);
     }
 
     trendChartInstance = new Chart(ctx, {
@@ -1928,6 +1910,15 @@ document.addEventListener("DOMContentLoaded", function () {
     });
   }
 
+  const trendChartFieldSelect = document.getElementById("trendChartFieldSelect");
+  if (trendChartFieldSelect) {
+    trendChartFieldSelect.addEventListener("change", function () {
+      const startDate = document.getElementById("startDate").value;
+      const endDate = document.getElementById("endDate").value;
+      applyDateFilter(startDate, endDate);
+    });
+  }
+
   // ========== Follow-up Management ==========
   const followupSection = document.getElementById("followupSection");
   const addFollowUpBtn = document.getElementById("addFollowUpBtn");