diff --git a/src/views/StockOverview/components/MarketHeatmap/components/HeatmapLegend.tsx b/src/views/StockOverview/components/MarketHeatmap/components/HeatmapLegend.tsx
new file mode 100644
index 00000000..04d03ab3
--- /dev/null
+++ b/src/views/StockOverview/components/MarketHeatmap/components/HeatmapLegend.tsx
@@ -0,0 +1,50 @@
+/**
+ * HeatmapLegend - 热力图图例组件
+ */
+import React, { memo } from 'react';
+import { HStack, Box, Text } from '@chakra-ui/react';
+import { COLORS } from '../styles';
+
+interface LegendItem {
+  color: string;
+  label: string;
+  glow?: boolean;
+}
+
+const LEGEND_ITEMS: LegendItem[] = [
+  { color: COLORS.up, label: '上涨', glow: true },
+  { color: COLORS.neutral, label: '平盘' },
+  { color: COLORS.down, label: '下跌', glow: true },
+];
+
+const HeatmapLegend: React.FC = memo(() => {
+  return (
+    <HStack
+      spacing={4}
+      align="center"
+      position="absolute"
+      top="5px"
+      right="8px"
+      zIndex={10}
+    >
+      {LEGEND_ITEMS.map(({ color, label, glow }) => (
+        <HStack key={label} spacing={2}>
+          <Box
+            w={3}
+            h={3}
+            bg={color}
+            borderRadius="sm"
+            boxShadow={glow ? `0 0 8px ${color}50` : undefined}
+          />
+          <Text fontSize="xs" color={COLORS.text}>
+            {label}
+          </Text>
+        </HStack>
+      ))}
+    </HStack>
+  );
+});
+
+HeatmapLegend.displayName = 'HeatmapLegend';
+
+export default HeatmapLegend;
diff --git a/src/views/StockOverview/components/MarketHeatmap/components/index.ts b/src/views/StockOverview/components/MarketHeatmap/components/index.ts
new file mode 100644
index 00000000..24020838
--- /dev/null
+++ b/src/views/StockOverview/components/MarketHeatmap/components/index.ts
@@ -0,0 +1 @@
+export { default as HeatmapLegend } from './HeatmapLegend';
diff --git a/src/views/StockOverview/components/MarketHeatmap/index.tsx b/src/views/StockOverview/components/MarketHeatmap/index.tsx
new file mode 100644
index 00000000..df06e3c9
--- /dev/null
+++ b/src/views/StockOverview/components/MarketHeatmap/index.tsx
@@ -0,0 +1,192 @@
+/**
+ * MarketHeatmap - 市值热力图组件
+ * 使用 ECharts treemap 展示 A 股市场全景
+ *
+ * 优化点：
+ * 1. 类型拆分到 types.ts
+ * 2. 样式常量拆分到 styles.ts
+ * 3. 工具函数拆分到 utils.ts
+ * 4. Legend 拆分为原子组件
+ */
+import React, { useRef, useEffect, useCallback, memo, useMemo } from 'react';
+import { Box, Center, VStack, Spinner, Text } from '@chakra-ui/react';
+import { echarts } from '@lib/echarts';
+
+import type { MarketHeatmapProps, TreeNodeData } from './types';
+import { HeatmapLegend } from './components';
+import { COLORS, CHART_CONFIG, LABEL_DISPLAY_THRESHOLD } from './styles';
+import { buildTreeData, formatGroupTooltip, formatStockTooltip } from './utils';
+
+const MarketHeatmap: React.FC<MarketHeatmapProps> = ({
+  data = [],
+  height = '400px',
+  loading = false,
+  onStockClick,
+  showLegend = true,
+}) => {
+  const chartRef = useRef<HTMLDivElement>(null);
+  const chartInstance = useRef<echarts.ECharts | null>(null);
+
+  // 缓存树图数据构建
+  const treeData = useMemo(() => {
+    if (!data || data.length === 0) return [];
+    return buildTreeData(data);
+  }, [data]);
+
+  // 缓存 ECharts 配置
+  const chartOption = useMemo(() => {
+    if (treeData.length === 0) return null;
+
+    return {
+      backgroundColor: COLORS.chartBg,
+      tooltip: {
+        backgroundColor: COLORS.tooltipBg,
+        borderColor: COLORS.gold,
+        borderWidth: 2,
+        textStyle: { color: 'white' },
+        formatter: (info: { data: TreeNodeData }) => {
+          const d = info.data;
+          if (d.children) {
+            return formatGroupTooltip(d);
+          }
+          return formatStockTooltip(d);
+        },
+      },
+      series: [
+        {
+          name: 'A股市场',
+          type: 'treemap',
+          data: treeData,
+          leafDepth: 1,
+          roam: false,
+          left: 0,
+          right: 0,
+          top: CHART_CONFIG.topOffset,
+          bottom: 0,
+          breadcrumb: {
+            show: true,
+            top: 5,
+            left: 5,
+            height: CHART_CONFIG.breadcrumbHeight,
+            itemStyle: {
+              color: COLORS.breadcrumbBg,
+              borderColor: COLORS.gold,
+              borderWidth: 1,
+              shadowBlur: 5,
+              shadowColor: `${COLORS.gold}40`,
+              textStyle: { color: COLORS.gold, fontSize: 11 },
+            },
+            emphasis: {
+              itemStyle: {
+                color: COLORS.gold,
+                textStyle: { color: COLORS.chartBg },
+              },
+            },
+          },
+          levels: [
+            {
+              itemStyle: {
+                borderColor: 'transparent',
+                borderWidth: 0,
+                gapWidth: 0,
+              },
+              upperLabel: { show: false },
+            },
+            {
+              itemStyle: {
+                borderColor: CHART_CONFIG.borderColor,
+                borderWidth: CHART_CONFIG.borderWidth,
+                gapWidth: 0,
+              },
+            },
+          ],
+          itemStyle: {
+            borderColor: CHART_CONFIG.borderColor,
+            borderWidth: CHART_CONFIG.borderWidth,
+            gapWidth: 0,
+          },
+          label: {
+            show: true,
+            formatter: (params: { data: TreeNodeData; name: string }) => {
+              const d = params.data;
+              if (d.children) return params.name;
+              return (d.value || 0) > LABEL_DISPLAY_THRESHOLD ? d.name : '';
+            },
+            fontSize: 11,
+            color: 'white',
+            textShadowColor: 'rgba(0, 0, 0, 0.8)',
+            textShadowBlur: 3,
+          },
+        },
+      ],
+    };
+  }, [treeData]);
+
+  // 渲染热力图
+  const renderChart = useCallback(() => {
+    if (!chartRef.current || !chartOption) return;
+
+    // 初始化或获取 ECharts 实例
+    if (!chartInstance.current) {
+      chartInstance.current = echarts.init(chartRef.current, 'dark');
+    }
+
+    chartInstance.current.setOption(chartOption);
+
+    // 点击事件
+    chartInstance.current.off('click');
+    chartInstance.current.on('click', (params) => {
+      const data = params.data as TreeNodeData | undefined;
+      if (data && data.code && !data.children) {
+        onStockClick?.(data.code, data.name);
+      }
+    });
+  }, [chartOption, onStockClick]);
+
+  // 初始化和更新
+  useEffect(() => {
+    if (!loading && data.length > 0) {
+      // 销毁旧实例
+      if (chartInstance.current) {
+        chartInstance.current.dispose();
+        chartInstance.current = null;
+      }
+      setTimeout(() => renderChart(), 50);
+    }
+  }, [data, loading, renderChart]);
+
+  // 窗口大小变化
+  useEffect(() => {
+    const handleResize = () => {
+      chartInstance.current?.resize();
+    };
+    window.addEventListener('resize', handleResize);
+    return () => {
+      window.removeEventListener('resize', handleResize);
+      chartInstance.current?.dispose();
+    };
+  }, []);
+
+  if (loading) {
+    return (
+      <Center h={height}>
+        <VStack spacing={4}>
+          <Spinner size="lg" color={COLORS.gold} thickness="3px" />
+          <Text color={COLORS.subText} fontSize="sm">加载热力图...</Text>
+        </VStack>
+      </Center>
+    );
+  }
+
+  return (
+    <Box position="relative">
+      <Box ref={chartRef} h={height} w="100%" />
+      {showLegend && <HeatmapLegend />}
+    </Box>
+  );
+};
+
+export default memo(MarketHeatmap);
+
+// 导出类型供外部使用
+export type { MarketHeatmapProps, HeatmapDataItem } from './types';
diff --git a/src/views/StockOverview/components/MarketHeatmap/styles.ts b/src/views/StockOverview/components/MarketHeatmap/styles.ts
new file mode 100644
index 00000000..fe3d8a4d
--- /dev/null
+++ b/src/views/StockOverview/components/MarketHeatmap/styles.ts
@@ -0,0 +1,52 @@
+/**
+ * MarketHeatmap 样式常量
+ */
+
+/** 颜色常量 */
+export const COLORS = {
+  // 主题色
+  gold: '#8b5cf6',
+
+  // 文字颜色
+  text: 'rgba(255, 255, 255, 0.95)',
+  subText: 'rgba(255, 255, 255, 0.6)',
+
+  // 涨跌颜色
+  up: '#ff4d4d',
+  down: '#22c55e',
+  neutral: '#333333',
+
+  // 背景
+  chartBg: '#0a0a0a',
+  tooltipBg: '#1a1a1a',
+  breadcrumbBg: '#1a1a2e',
+} as const;
+
+/** ECharts 配置常量 */
+export const CHART_CONFIG = {
+  /** 顶部留白（给面包屑和图例留空间） */
+  topOffset: 40,
+  /** 面包屑高度 */
+  breadcrumbHeight: 20,
+  /** 边框宽度 */
+  borderWidth: 0.5,
+  /** 边框颜色 */
+  borderColor: 'rgba(10, 10, 10, 0.2)',
+} as const;
+
+/** 涨跌幅阈值 */
+export const CHANGE_THRESHOLDS = {
+  /** 最大涨跌幅用于颜色计算 */
+  maxChange: 10,
+  /** 上涨基础透明度 */
+  upBaseOpacity: 0.4,
+  /** 上涨最大额外透明度 */
+  upMaxOpacity: 0.6,
+  /** 下跌基础透明度 */
+  downBaseOpacity: 0.3,
+  /** 下跌最大额外透明度 */
+  downMaxOpacity: 0.5,
+} as const;
+
+/** 市值显示阈值（亿） */
+export const LABEL_DISPLAY_THRESHOLD = 5;
diff --git a/src/views/StockOverview/components/MarketHeatmap/types.ts b/src/views/StockOverview/components/MarketHeatmap/types.ts
new file mode 100644
index 00000000..d92cb85a
--- /dev/null
+++ b/src/views/StockOverview/components/MarketHeatmap/types.ts
@@ -0,0 +1,49 @@
+/**
+ * MarketHeatmap 类型定义
+ */
+
+/** 热力图数据项 */
+export interface HeatmapDataItem {
+  stock_code: string;
+  stock_name: string;
+  change_percent: number;
+  market_cap: number;
+  amount: number;
+  industry?: string;
+  province?: string;
+}
+
+/** MarketHeatmap 组件 Props */
+export interface MarketHeatmapProps {
+  /** 热力图数据 */
+  data?: HeatmapDataItem[];
+  /** 热力图高度，默认 400px */
+  height?: string;
+  /** 加载状态 */
+  loading?: boolean;
+  /** 点击股票回调 */
+  onStockClick?: (stockCode: string, stockName: string) => void;
+  /** 是否显示图例，默认 true */
+  showLegend?: boolean;
+}
+
+/** 树图节点数据 */
+export interface TreeNodeData {
+  name: string;
+  value?: number;
+  change?: number;
+  code?: string;
+  amount?: number;
+  industry?: string;
+  province?: string;
+  itemStyle?: { color: string };
+  children?: TreeNodeData[];
+}
+
+/** 市值区间类型 */
+export type MarketCapRange =
+  | '超大盘股(>1000亿)'
+  | '大盘股(500-1000亿)'
+  | '中盘股(100-500亿)'
+  | '小盘股(50-100亿)'
+  | '微盘股(<50亿)';
diff --git a/src/views/StockOverview/components/MarketHeatmap/utils.ts b/src/views/StockOverview/components/MarketHeatmap/utils.ts
new file mode 100644
index 00000000..3473004e
--- /dev/null
+++ b/src/views/StockOverview/components/MarketHeatmap/utils.ts
@@ -0,0 +1,105 @@
+/**
+ * MarketHeatmap 工具函数
+ */
+import type { HeatmapDataItem, TreeNodeData, MarketCapRange } from './types';
+import { COLORS, CHANGE_THRESHOLDS } from './styles';
+
+/**
+ * 获取市值区间标签
+ */
+export const getMarketCapRange = (cap: number): MarketCapRange => {
+  if (cap >= 1000) return '超大盘股(>1000亿)';
+  if (cap >= 500) return '大盘股(500-1000亿)';
+  if (cap >= 100) return '中盘股(100-500亿)';
+  if (cap >= 50) return '小盘股(50-100亿)';
+  return '微盘股(<50亿)';
+};
+
+/**
+ * 根据涨跌幅计算颜色
+ */
+export const getChangeColor = (change: number): string => {
+  if (change > 0) {
+    const intensity = Math.min(change / CHANGE_THRESHOLDS.maxChange, 1);
+    const opacity = CHANGE_THRESHOLDS.upBaseOpacity + intensity * CHANGE_THRESHOLDS.upMaxOpacity;
+    return `rgba(255, 77, 77, ${opacity})`;
+  }
+  if (change < 0) {
+    const intensity = Math.min(Math.abs(change) / CHANGE_THRESHOLDS.maxChange, 1);
+    const opacity = CHANGE_THRESHOLDS.downBaseOpacity + intensity * CHANGE_THRESHOLDS.downMaxOpacity;
+    return `rgba(34, 197, 94, ${opacity})`;
+  }
+  return COLORS.neutral;
+};
+
+/**
+ * 按市值分组数据
+ */
+export const groupByMarketCap = (data: HeatmapDataItem[]): Record<MarketCapRange, HeatmapDataItem[]> => {
+  const grouped: Record<string, HeatmapDataItem[]> = {};
+
+  data.forEach(item => {
+    const range = getMarketCapRange(item.market_cap);
+    if (!grouped[range]) {
+      grouped[range] = [];
+    }
+    grouped[range].push(item);
+  });
+
+  return grouped as Record<MarketCapRange, HeatmapDataItem[]>;
+};
+
+/**
+ * 构建树图数据
+ */
+export const buildTreeData = (data: HeatmapDataItem[]): TreeNodeData[] => {
+  const groupedData = groupByMarketCap(data);
+
+  return Object.entries(groupedData).map(([range, stocks]) => ({
+    name: range,
+    children: stocks.map(stock => ({
+      name: stock.stock_name,
+      value: Math.abs(stock.market_cap),
+      change: stock.change_percent || 0,
+      code: stock.stock_code,
+      amount: stock.amount,
+      industry: stock.industry,
+      province: stock.province,
+      itemStyle: { color: getChangeColor(stock.change_percent || 0) },
+    })),
+  }));
+};
+
+/**
+ * 生成分组 tooltip HTML
+ */
+export const formatGroupTooltip = (data: TreeNodeData): string => {
+  const totalMarketCap = data.children?.reduce((sum, item) => sum + (item.value || 0), 0) || 0;
+  return `
+    <div style="padding: 10px; color: white;">
+      <div style="font-weight: bold; margin-bottom: 6px; font-size: 14px; color: ${COLORS.gold};">${data.name}</div>
+      <div style="color: #ccc;">包含 ${data.children?.length || 0} 只股票</div>
+      <div style="color: #ccc;">总市值: <span style="color: ${COLORS.gold}; font-weight: bold;">${totalMarketCap.toFixed(2)}</span> 亿元</div>
+    </div>
+  `;
+};
+
+/**
+ * 生成股票 tooltip HTML
+ */
+export const formatStockTooltip = (data: TreeNodeData): string => {
+  const changeColor = (data.change || 0) > 0 ? COLORS.up : COLORS.down;
+  const changeSign = (data.change || 0) > 0 ? '+' : '';
+  return `
+    <div style="padding: 10px; color: white;">
+      <div style="font-weight: bold; margin-bottom: 6px; font-size: 14px; color: ${COLORS.gold};">${data.name}</div>
+      <div style="color: #ccc;">代码: ${data.code || '-'}</div>
+      <div style="color: #ccc;">涨跌幅: <span style="color: ${changeColor}; font-weight: bold;">
+        ${changeSign}${data.change?.toFixed(2) || 0}%
+      </span></div>
+      <div style="color: #ccc;">市值: <span style="font-weight: bold;">${data.value?.toFixed(2) || 0}</span> 亿元</div>
+      <div style="color: #ccc;">成交额: <span style="font-weight: bold;">${data.amount?.toFixed(2) || 0}</span> 亿元</div>
+      <div style="color: #ccc;">行业: ${data.industry || '未知'}</div>
+    </div>
+  `;
+};