diff --git a/backend/services/themes.py b/backend/services/themes.py
index e66290e..0f6fc85 100644
--- a/backend/services/themes.py
+++ b/backend/services/themes.py
@@ -370,7 +370,7 @@ async def _build_theme_graph(sort_field: int, top_n: int) -> dict:
 
     return {
         "themes": [
-            {"themeCode": t["themeCode"], "themeName": t["themeName"], "stockCount": t["stockCount"]}
+            {"themeCode": t["themeCode"], "themeName": t["themeName"], "stockCount": t["stockCount"], "bf3": t.get("bf3")}
             for t in theme_map.values()
         ],
         "stocks": stocks,
diff --git a/src/lib/theme-api.ts b/src/lib/theme-api.ts
index 28c64ab..6a43dbc 100644
--- a/src/lib/theme-api.ts
+++ b/src/lib/theme-api.ts
@@ -165,6 +165,7 @@ export interface GraphTheme {
   themeCode: string;
   themeName: string;
   stockCount: number; // 题材内股票数
+  bf3: number | null; // 题材涨幅
 }
 
 export interface GraphStock {
diff --git a/src/routes/hot-map.tsx b/src/routes/hot-map.tsx
index f84b5aa..541df80 100644
--- a/src/routes/hot-map.tsx
+++ b/src/routes/hot-map.tsx
@@ -35,6 +35,10 @@ const MODES: { key: 1 | 4; label: string }[] = [
 /* 图视图股票节点上限：按覆盖题材数降序保留最高穿透度的核心股 */
 const MAX_STOCK_NODES = 800;
 
+/* 题材节点半径范围：按题材涨幅绝对值映射（涨得越猛球越大） */
+const THEME_MIN_RADIUS = 6;
+const THEME_MAX_RADIUS = 20;
+
 /* 视图切换：关系图 / 核心股列表 */
 type ViewMode = "graph" | "list";
 
@@ -272,6 +276,8 @@ interface SimNode extends SimulationNodeDatum {
   f100?: string;
   themeCodes?: string[];
   code?: string;
+  // theme 专属
+  bf3?: number | null; // 题材涨幅
 }
 
 interface SimEdge extends SimulationLinkDatum<SimNode> {
@@ -404,7 +410,7 @@ function drawStockNodes(
   ctx.globalAlpha = 1;
 }
 
-/** 题材节点：蓝色圆点 */
+/** 题材节点：涨幅正蓝负绿，大小按涨幅绝对值映射 */
 function drawThemeNodes(
   ctx: CanvasRenderingContext2D,
   nodes: SimNode[],
@@ -416,12 +422,13 @@ function drawThemeNodes(
     const isActive = activeId === n.id;
     const dim = activeSet ? !activeSet.has(n.id) : false;
     const r = isActive ? n.radius + 3 : n.radius;
+    const isPos = (n.bf3 ?? 0) >= 0;
     ctx.beginPath();
     ctx.arc(n.x ?? 0, n.y ?? 0, r, 0, TAU);
-    ctx.fillStyle = isActive ? "#2563eb" : "#3b82f6";
+    ctx.fillStyle = isActive ? (isPos ? "#2563eb" : "#16a34a") : isPos ? "#3b82f6" : "#22c55e";
     ctx.globalAlpha = dim ? 0.15 : 1;
     ctx.fill();
-    ctx.strokeStyle = "#1d4ed8";
+    ctx.strokeStyle = isPos ? "#1d4ed8" : "#15803d";
     ctx.lineWidth = 1.5;
     ctx.stroke();
   }
@@ -460,7 +467,8 @@ function drawThemeLabels(
     if (n.type !== "theme") continue;
     if (!showAll && activeId !== n.id) continue;
     const label = isCoarse ? (n.name.length > 5 ? n.name.slice(0, 5) + "…" : n.name) : n.name;
-    haloText(ctx, label, n.x ?? 0, (n.y ?? 0) + n.radius + 11, isCoarse ? 7.5 : 9, "#1e40af");
+    const labelColor = (n.bf3 ?? 0) >= 0 ? "#1e40af" : "#15803d";
+    haloText(ctx, label, n.x ?? 0, (n.y ?? 0) + n.radius + 11, isCoarse ? 7.5 : 9, labelColor);
   }
 }
 
@@ -654,14 +662,20 @@ function HotMapGraph({ graph }: { graph: ThemeGraph }) {
       themeCodes: s.themeCodes,
       radius: Math.min(18, 4 + s.coverCount * 1.3),
     }));
-    const themeNodes: SimNode[] = graph.themes.map((t) => ({
-      id: `t:${t.themeCode}`,
-      type: "theme" as const,
-      name: t.themeName,
-      code: t.themeCode,
-      coverCount: t.stockCount,
-      radius: 10,
-    }));
+    // 题材涨幅绝对值作为球大小的归一化基准（兜底 ≥1 防除零）
+    const maxAbsBf3 = Math.max(1, ...graph.themes.map((t) => Math.abs(t.bf3 ?? 0)));
+    const themeNodes: SimNode[] = graph.themes.map((t) => {
+      const bf3 = t.bf3 ?? 0;
+      return {
+        id: `t:${t.themeCode}`,
+        type: "theme" as const,
+        name: t.themeName,
+        code: t.themeCode,
+        coverCount: t.stockCount,
+        bf3: t.bf3,
+        radius: THEME_MIN_RADIUS + (Math.abs(bf3) / maxAbsBf3) * (THEME_MAX_RADIUS - THEME_MIN_RADIUS),
+      };
+    });
     const edgeList: SimEdge[] = buildEdgesFromStocks(kept);
 
     const stockByIdMap = new Map<string, GraphStock>();
@@ -1007,6 +1021,11 @@ function InfoCard({ node, stockById }: { node: SimNode; stockById: Map<string, G
       ) : (
         <>
           <p className="font-semibold">{node.name}</p>
+          {node.bf3 != null && (
+            <p className={`text-xs font-bold ${node.bf3 >= 0 ? "text-blue-600" : "text-green-600"}`}>
+              {node.bf3 >= 0 ? "+" : ""}{node.bf3.toFixed(2)}%
+            </p>
+          )}
           <p className="text-[10px] text-muted-foreground">代码 {node.code} · {node.coverCount} 只股票</p>
         </>
       )}
@@ -1065,6 +1084,11 @@ function BottomSheet({
           ) : (
             <>
               <p className="font-semibold text-sm">{node.name}</p>
+              {node.bf3 != null && (
+                <p className={`text-xs font-bold mt-0.5 ${node.bf3 >= 0 ? "text-blue-600" : "text-green-600"}`}>
+                  {node.bf3 >= 0 ? "+" : ""}{node.bf3.toFixed(2)}%
+                </p>
+              )}
               <p className="text-[10px] text-muted-foreground mt-0.5">
                 代码 {node.code} · 覆盖 {node.coverCount} 只股票
               </p>
@@ -1111,7 +1135,11 @@ function Legend({ maxCover, compact }: { maxCover: number; compact: boolean }) {
         </span>
         <span className="inline-flex items-center gap-1">
           <span className="inline-block rounded-full bg-blue-500" style={{ width: 8, height: 8 }} />
-          题材
+          题材涨
+        </span>
+        <span className="inline-flex items-center gap-1">
+          <span className="inline-block rounded-full bg-green-500" style={{ width: 8, height: 8 }} />
+          题材跌
         </span>
       </div>
     );
@@ -1131,8 +1159,13 @@ function Legend({ maxCover, compact }: { maxCover: number; compact: boolean }) {
       </div>
       <div className="flex items-center gap-2 pt-1 border-t border-border/40">
         <span className="inline-block rounded-full bg-blue-500" style={{ width: 10, height: 10 }} />
-        <span>题材节点</span>
+        <span>题材 · 涨幅为正</span>
       </div>
+      <div className="flex items-center gap-2">
+        <span className="inline-block rounded-full bg-green-500" style={{ width: 10, height: 10 }} />
+        <span>题材 · 涨幅为负</span>
+      </div>
+      <div className="text-[9px] text-muted-foreground pt-0.5">球大小随涨幅绝对值增大</div>
     </div>
   );
 }