diff --git a/src/routes/hot-map.tsx b/src/routes/hot-map.tsx
index 541df80..26f7e48 100644
--- a/src/routes/hot-map.tsx
+++ b/src/routes/hot-map.tsx
@@ -35,9 +35,9 @@ 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;
+/* 题材节点半径范围：按题材涨幅绝对值平方根映射（涨得越猛球越大，小涨幅区分更明显） */
+const THEME_MIN_RADIUS = 4;
+const THEME_MAX_RADIUS = 22;
 
 /* 视图切换：关系图 / 核心股列表 */
 type ViewMode = "graph" | "list";
@@ -673,7 +673,8 @@ function HotMapGraph({ graph }: { graph: ThemeGraph }) {
         code: t.themeCode,
         coverCount: t.stockCount,
         bf3: t.bf3,
-        radius: THEME_MIN_RADIUS + (Math.abs(bf3) / maxAbsBf3) * (THEME_MAX_RADIUS - THEME_MIN_RADIUS),
+        // 平方根映射：同一个小涨幅区间内球径差异更大（线性映射被极端涨幅拉平均）
+        radius: THEME_MIN_RADIUS + Math.sqrt(Math.abs(bf3) / maxAbsBf3) * (THEME_MAX_RADIUS - THEME_MIN_RADIUS),
       };
     });
     const edgeList: SimEdge[] = buildEdgesFromStocks(kept);