diff --git a/components/TimeRangePicker.js b/components/TimeRangePicker.js
new file mode 100644
index 0000000..ea38ca7
--- /dev/null
+++ b/components/TimeRangePicker.js
@@ -0,0 +1,145 @@
+import { useState, useEffect } from 'react'
+
+const TimeRangePicker = ({ 
+  value = '1m', 
+  onChange, 
+  className = '' 
+}) => {
+  const [timeRange, setTimeRange] = useState(value)
+  const [startDate, setStartDate] = useState('')
+  const [endDate, setEndDate] = useState('')
+  const [showDropdown, setShowDropdown] = useState(false)
+
+  // 计算日期范围
+  const calculateDateRange = (range) => {
+    const end = new Date()
+    const start = new Date()
+    
+    if (range === '1m') {
+      start.setMonth(start.getMonth() - 1)
+    } else if (range === '3m') {
+      start.setMonth(start.getMonth() - 3)
+    } else if (range === '1y') {
+      start.setFullYear(start.getFullYear() - 1)
+    }
+    
+    const formatDate = (date) => {
+      return date.toISOString().split('T')[0]
+    }
+    
+    return {
+      start: formatDate(start),
+      end: formatDate(end)
+    }
+  }
+
+  // 初始化时设置日期范围
+  useEffect(() => {
+    const range = calculateDateRange(value)
+    setStartDate(range.start)
+    setEndDate(range.end)
+  }, [value])
+
+  // 处理时间范围变化
+  const handleTimeRangeChange = (range) => {
+    const dateRange = calculateDateRange(range)
+    setStartDate(dateRange.start)
+    setEndDate(dateRange.end)
+    setTimeRange(range)
+    if (onChange) {
+      onChange(range, dateRange.start, dateRange.end)
+    }
+    setShowDropdown(false)
+  }
+
+  // 处理自定义日期范围
+  const handleCustomRangeApply = () => {
+    if (startDate && endDate) {
+      setTimeRange('custom')
+      if (onChange) {
+        onChange('custom', startDate, endDate)
+      }
+      setShowDropdown(false)
+    }
+  }
+
+  // 处理开始日期变化
+  const handleStartDateChange = (e) => {
+    setStartDate(e.target.value)
+  }
+
+  // 处理结束日期变化
+  const handleEndDateChange = (e) => {
+    setEndDate(e.target.value)
+  }
+
+  return (
+    <div className={`time-range-picker ${className}`}>
+      <button 
+        className="time-range-btn"
+        onClick={() => setShowDropdown(!showDropdown)}
+      >
+        {timeRange === '1m' && '近一个月'}
+        {timeRange === '3m' && '近三个月'}
+        {timeRange === '1y' && '近一年'}
+        {timeRange === 'custom' && startDate && endDate && `${startDate} 至 ${endDate}`}
+        {timeRange === 'custom' && (!startDate || !endDate) && '自定义'}
+        <span className="dropdown-arrow">▼</span>
+      </button>
+      {showDropdown && (
+        <div className="time-range-dropdown">
+          <div className="dropdown-section">
+            <h4 className="dropdown-title">自定义范围</h4>
+            <div className="custom-date-range">
+              <input 
+                type="date" 
+                value={startDate} 
+                onChange={handleStartDateChange}
+                max={endDate || new Date().toISOString().split('T')[0]}
+              />
+              <span>至</span>
+              <input 
+                type="date" 
+                value={endDate} 
+                onChange={handleEndDateChange}
+                min={startDate}
+                max={new Date().toISOString().split('T')[0]}
+              />
+              <button 
+                className="apply-btn"
+                onClick={handleCustomRangeApply}
+              >
+                确定
+              </button>
+            </div>
+          </div>
+          <div className="dropdown-section">
+            <h4 className="dropdown-title">快捷选项</h4>
+            <ul className="dropdown-options">
+              <li 
+                className={`dropdown-option ${timeRange === '1m' ? 'active' : ''}`}
+                onClick={() => handleTimeRangeChange('1m')}
+              >
+                近一个月
+              </li>
+              <li 
+                className={`dropdown-option ${timeRange === '3m' ? 'active' : ''}`}
+                onClick={() => handleTimeRangeChange('3m')}
+              >
+                近三个月
+              </li>
+              <li 
+                className={`dropdown-option ${timeRange === '1y' ? 'active' : ''}`}
+                onClick={() => handleTimeRangeChange('1y')}
+              >
+                近一年
+              </li>
+            </ul>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
+export default TimeRangePicker
diff --git a/pages/api/exchange-rate.js b/pages/api/exchange-rate.js
index 3ecb5e1..32cba0f 100644
--- a/pages/api/exchange-rate.js
+++ b/pages/api/exchange-rate.js
@@ -98,8 +98,11 @@ export default async function handler(req, res) {
       error: error.message
     });
   } finally {
-    if (pool) {
-      await pool.end();
-    }
+    // 不关闭连接池，保持连接池打开以提高性能
+    // 如果需要关闭连接池，应该在关闭后将 pool 变量设置为 null
+    // if (pool) {
+    //   await pool.end();
+    //   pool = null;
+    // }
   }
 }
diff --git a/pages/data.js b/pages/data.js
index c169462..2d08de7 100644
--- a/pages/data.js
+++ b/pages/data.js
@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react'
 import Head from 'next/head'
 import Navbar from '../components/Navbar'
 import Footer from '../components/Footer'
+import TimeRangePicker from '../components/TimeRangePicker'
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer } from 'recharts'
 
 const chinaBondData = [
@@ -162,18 +163,39 @@ export default function Data() {
   const [exchangeRateData, setExchangeRateData] = useState([])
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState(null)
+  const [timeRange, setTimeRange] = useState('1m') // 1m: 近一个月, 3m: 近三个月, 1y: 近一年, custom: 自定义
+  const [startDate, setStartDate] = useState('')
+  const [endDate, setEndDate] = useState('')
 
   useEffect(() => {
     if (selectedIndicator === 'central-bank-usd-cny-rate') {
       fetchExchangeRateData()
     }
-  }, [selectedIndicator])
+  }, [selectedIndicator, timeRange, startDate, endDate])
+
+  const handleTimeRangeChange = (range, start, end) => {
+    setTimeRange(range)
+    setStartDate(start)
+    setEndDate(end)
+  }
 
   const fetchExchangeRateData = async () => {
     setLoading(true)
     setError(null)
     try {
-      const response = await fetch('/api/exchange-rate?limit=60')
+      let url = '/api/exchange-rate'
+      
+      if (timeRange === 'custom' && startDate && endDate) {
+        url += `?startDate=${startDate}&endDate=${endDate}`
+      } else if (timeRange === '1m') {
+        url += '?limit=30'
+      } else if (timeRange === '3m') {
+        url += '?limit=90'
+      } else if (timeRange === '1y') {
+        url += '?limit=365'
+      }
+      
+      const response = await fetch(url)
       const data = await response.json()
       if (data.success) {
         setExchangeRateData(data.data)
@@ -566,6 +588,13 @@ export default function Data() {
                   <div className="error">{error}</div>
                 ) : (
                   <>
+                    <div className="chart-header">
+                      <TimeRangePicker 
+                        value={timeRange}
+                        onChange={handleTimeRangeChange}
+                      />
+                    </div>
+                    
                     <div className="chart-container">
                       <ResponsiveContainer width="100%" height={500}>
                         <LineChart data={exchangeRateData} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
diff --git a/styles/globals.css b/styles/globals.css
index 27c607c..201e9fb 100644
--- a/styles/globals.css
+++ b/styles/globals.css
@@ -493,3 +493,154 @@ main {
   margin-bottom: 1rem;
 }
 
+/* Time range selector */
+.chart-header {
+  display: flex;
+  justify-content: flex-end;
+  margin-bottom: 10px;
+}
+
+.time-range-picker {
+  position: relative;
+  display: inline-block;
+}
+
+.time-range-btn {
+  padding: 8px 16px;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  background-color: #fff;
+  cursor: pointer;
+  font-size: 14px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 150px;
+  justify-content: space-between;
+  transition: all 0.3s ease;
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
+}
+
+.time-range-btn:hover {
+  border-color: #333;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+}
+
+.dropdown-arrow {
+  font-size: 12px;
+  color: #666;
+  transition: transform 0.3s ease;
+}
+
+.time-range-dropdown {
+  position: absolute;
+  top: 100%;
+  right: 0;
+  margin-top: 8px;
+  background-color: #fff;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  padding: 16px;
+  min-width: 300px;
+  z-index: 1000;
+}
+
+.dropdown-section {
+  margin-bottom: 16px;
+}
+
+.dropdown-section:last-child {
+  margin-bottom: 0;
+}
+
+.dropdown-title {
+  font-size: 12px;
+  font-weight: 600;
+  color: #999;
+  margin-bottom: 8px;
+  text-transform: uppercase;
+}
+
+.dropdown-options {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.dropdown-option {
+  padding: 8px 12px;
+  cursor: pointer;
+  border-radius: 4px;
+  transition: all 0.2s ease;
+  font-size: 14px;
+}
+
+.dropdown-option:hover {
+  background-color: #f0f0f0;
+}
+
+.dropdown-option.active {
+  background-color: #333;
+  color: #fff;
+}
+
+.custom-date-range {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+}
+
+.custom-date-range input[type="date"] {
+  padding: 6px 8px;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  font-size: 14px;
+  min-width: 120px;
+}
+
+.custom-date-range span {
+  font-size: 14px;
+  color: #666;
+  white-space: nowrap;
+}
+
+.apply-btn {
+  padding: 6px 12px;
+  border: 1px solid #333;
+  border-radius: 4px;
+  background-color: #333;
+  color: #fff;
+  cursor: pointer;
+  font-size: 14px;
+  transition: all 0.3s ease;
+}
+
+.apply-btn:hover {
+  background-color: #555;
+  border-color: #555;
+}
+
+.apply-btn:disabled {
+  background-color: #f0f0f0;
+  color: #999;
+  border-color: #ddd;
+  cursor: not-allowed;
+}
+
+/* Loading and error states */
+.loading {
+  text-align: center;
+  padding: 40px;
+  font-size: 16px;
+  color: #666;
+}
+
+.error {
+  text-align: center;
+  padding: 40px;
+  font-size: 16px;
+  color: #e53935;
+}
+