diff --git a/docs/qqbot-bangdream-tsugu-global-refactor-plan.md b/docs/qqbot-bangdream-tsugu-global-refactor-plan.md
index 529aafb..d810419 100644
--- a/docs/qqbot-bangdream-tsugu-global-refactor-plan.md
+++ b/docs/qqbot-bangdream-tsugu-global-refactor-plan.md
@@ -388,6 +388,7 @@ export interface TsuguHook {
 - 已新增 `render-blocks/list-player-card-icon-spec.ts`，收口玩家详情主卡组展示顺序、默认行高、文本字号比例、卡牌间距比例和卡牌图标可见性标记；`list-player-card-icon-list.ts` 改为消费 spec，主卡组渲染顺序和输出结构保持不变；`list-player-card-icon-spec.spec.ts` 覆盖历史卡牌顺序、缺失条目跳过和字号/间距计算，本地 `/查玩家 26591455 jp` 图片 smoke 输出非空。
 - 已新增 `render-blocks/list-card-icon-spec.ts`，收口通用卡牌图标列表默认行高、文本字号比例、卡牌间距比例、默认可见性标记和历史排序比较器；`list-card-icon-list.ts` 改为消费 spec，卡牌图标列表排序和输出结构保持不变；`list-card-icon-spec.spec.ts` 覆盖稀有度排序、优先卡牌类型排序、普通卡按 ID 排序和字号/间距计算，本地 `/查卡 472` 图片 smoke 输出非空。
 - 已新增 `render-blocks/list-song-spec.ts`，收口歌曲列表单行封面、文本、难度块位置、列表内容宽度、分割线高度和外层行高计算；`list-song.ts` 改为消费 spec，歌曲列表绘制顺序和输出结构保持不变；`list-song-spec.spec.ts` 覆盖单行尺寸、难度块垂直居中和歌曲组列表尺寸，本地 `/查曲 136` 图片 smoke 输出非空。
+- 已新增 `render-blocks/list-difficulty-spec.ts`，收口难度列表默认高度/间距、徽章兜底色、圆形布局和等级文字比例/居中计算；`list-difficulty.ts` 改为消费 spec，难度列表绘制顺序和输出结构保持不变；`list-difficulty-spec.spec.ts` 覆盖列表宽度、条目偏移、徽章颜色、圆形布局和文字居中，本地 `/查曲 136` 图片 smoke 输出非空。
 - smoke/Jenkins/远程调试卡点继续按已固化规则处理：同一卡点第二次尝试前必须改变可验证变量；Jenkins 查询 URL 含方括号时用 `curl -g` 或改查 Jenkins home；线上图片 smoke 必须查询 `commandId`、拉回图片、展示图片、查日志并清理本轮临时目录；PowerShell 双引号 here-string 中不要写 JS `${...}` 模板字面量，避免被 PowerShell 提前插值；smoke 没有真实图片落盘时必须失败。
 
 ### Phase 6：策略 policy 和时间/档线规则
diff --git a/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty-spec.ts b/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty-spec.ts
new file mode 100644
index 0000000..176a0c8
--- /dev/null
+++ b/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty-spec.ts
@@ -0,0 +1,116 @@
+interface ImageLike {
+  height: number;
+  width: number;
+}
+
+export const BANGDREAM_DIFFICULTY_LIST_SPEC = {
+  badge: {
+    arcStart: 0,
+    fallbackColor: '#f1f1f1',
+    fullCircleRadian: Math.PI * 2,
+    textMaxWidthRatio: 3,
+    textSizeRatio: 2 / 3,
+  },
+  list: {
+    defaultImageHeight: 60,
+    defaultSpacing: 10,
+  },
+} as const;
+
+/**
+ * 计算难度列表画布宽度。
+ *
+ * @param difficultyCount - 难度数量。
+ * @param imageHeight - 单个难度徽章高度。
+ * @param spacing - 难度徽章间距。
+ */
+export function getDifficultyListCanvasWidth(
+  difficultyCount: number,
+  imageHeight: number,
+  spacing: number,
+) {
+  return imageHeight * difficultyCount + (difficultyCount - 1) * spacing;
+}
+
+/**
+ * 计算难度徽章在列表中的横向位置。
+ *
+ * @param index - 难度下标。
+ * @param imageHeight - 单个难度徽章高度。
+ * @param spacing - 难度徽章间距。
+ */
+export function getDifficultyListItemX(
+  index: number,
+  imageHeight: number,
+  spacing: number,
+) {
+  return index * (imageHeight + spacing);
+}
+
+/**
+ * 获取难度徽章颜色。
+ *
+ * @param difficultyType - 难度类型。
+ * @param colors - 难度颜色表。
+ */
+export function getDifficultyBadgeColor(
+  difficultyType: number,
+  colors: ReadonlyArray<string | undefined>,
+) {
+  return (
+    colors[difficultyType] ??
+    BANGDREAM_DIFFICULTY_LIST_SPEC.badge.fallbackColor
+  );
+}
+
+/**
+ * 计算难度徽章圆形布局。
+ *
+ * @param imageHeight - 难度徽章高度。
+ */
+export function createDifficultyBadgeLayout(imageHeight: number) {
+  return {
+    arcEnd: BANGDREAM_DIFFICULTY_LIST_SPEC.badge.fullCircleRadian,
+    arcRadius: imageHeight / 2,
+    arcStart: BANGDREAM_DIFFICULTY_LIST_SPEC.badge.arcStart,
+    arcX: imageHeight / 2,
+    arcY: imageHeight / 2,
+    canvasHeight: imageHeight,
+    canvasWidth: imageHeight,
+  };
+}
+
+/**
+ * 计算难度等级文字绘制参数。
+ *
+ * @param imageHeight - 难度徽章高度。
+ * @param playLevel - 谱面等级。
+ */
+export function createDifficultyLevelTextSpec(
+  imageHeight: number,
+  playLevel: number,
+) {
+  return {
+    maxWidth:
+      imageHeight * BANGDREAM_DIFFICULTY_LIST_SPEC.badge.textMaxWidthRatio,
+    text: playLevel.toString(),
+    textSize:
+      imageHeight * BANGDREAM_DIFFICULTY_LIST_SPEC.badge.textSizeRatio,
+  };
+}
+
+/**
+ * 计算难度等级文字居中位置。
+ *
+ * @param imageHeight - 难度徽章高度。
+ * @param levelText - 已渲染的等级文字图片。
+ */
+export function getDifficultyLevelTextPosition(
+  imageHeight: number,
+  levelText: ImageLike,
+) {
+  return {
+    x: imageHeight / 2 - levelText.width / 2,
+    y: imageHeight / 2 - levelText.height / 2,
+  };
+}
diff --git a/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty.ts b/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty.ts
index a670ab6..a02ccdd 100644
--- a/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty.ts
+++ b/src/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty.ts
@@ -2,6 +2,15 @@ import { Canvas } from 'skia-canvas';
 import { Song } from '@/qqbot/plugins/bangDream/tsugu/models/song';
 import { drawText } from '@/qqbot/plugins/bangDream/tsugu/canvas/text';
 import { difficultyColorList } from '@/qqbot/plugins/bangDream/tsugu/models/song';
+import {
+  BANGDREAM_DIFFICULTY_LIST_SPEC,
+  createDifficultyBadgeLayout,
+  createDifficultyLevelTextSpec,
+  getDifficultyBadgeColor,
+  getDifficultyLevelTextPosition,
+  getDifficultyListCanvasWidth,
+  getDifficultyListItemX,
+} from './list-difficulty-spec';
 
 /**
  * 在图片布局层中绘制难度列表。
@@ -13,12 +22,13 @@ import { difficultyColorList } from '@/qqbot/plugins/bangDream/tsugu/models/song
  */
 export function drawDifficultyList(
   song: Song,
-  imageHeight: number = 60,
-  spacing: number = 10,
+  imageHeight: number = BANGDREAM_DIFFICULTY_LIST_SPEC.list
+    .defaultImageHeight,
+  spacing: number = BANGDREAM_DIFFICULTY_LIST_SPEC.list.defaultSpacing,
 ): Canvas {
   const difficultyCount = Object.keys(song.difficulty).length;
   const canvas = new Canvas(
-    imageHeight * difficultyCount + (difficultyCount - 1) * spacing,
+    getDifficultyListCanvasWidth(difficultyCount, imageHeight, spacing),
     imageHeight,
   );
   const ctx = canvas.getContext('2d');
@@ -26,7 +36,7 @@ export function drawDifficultyList(
     const i = parseInt(d);
     ctx.drawImage(
       drawDifficulty(i, song.difficulty[i].playLevel, imageHeight),
-      i * (imageHeight + spacing),
+      getDifficultyListItemX(i, imageHeight, spacing),
       0,
     );
   }
@@ -47,22 +57,20 @@ export function drawDifficulty(
 ) {
   const tempCanvas = new Canvas(imageHeight, imageHeight);
   const ctx = tempCanvas.getContext('2d');
-  if (difficultyColorList[difficultyType] != undefined) {
-    ctx.fillStyle = difficultyColorList[difficultyType];
-  } else {
-    ctx.fillStyle = '#f1f1f1';
-  }
-  ctx.arc(imageHeight / 2, imageHeight / 2, imageHeight / 2, 0, 2 * Math.PI);
-  ctx.fill();
-  const levelText = drawText({
-    textSize: (imageHeight / 3) * 2,
-    text: playLevel.toString(),
-    maxWidth: imageHeight * 3,
-  });
-  ctx.drawImage(
-    levelText,
-    imageHeight / 2 - levelText.width / 2,
-    imageHeight / 2 - levelText.height / 2,
+  const badgeLayout = createDifficultyBadgeLayout(imageHeight);
+  ctx.fillStyle = getDifficultyBadgeColor(difficultyType, difficultyColorList);
+  ctx.arc(
+    badgeLayout.arcX,
+    badgeLayout.arcY,
+    badgeLayout.arcRadius,
+    badgeLayout.arcStart,
+    badgeLayout.arcEnd,
   );
+  ctx.fill();
+  const levelText = drawText(
+    createDifficultyLevelTextSpec(imageHeight, playLevel),
+  );
+  const position = getDifficultyLevelTextPosition(imageHeight, levelText);
+  ctx.drawImage(levelText, position.x, position.y);
   return tempCanvas;
 }
diff --git a/test/qqbot/plugins/bangDream/tsugu/list-difficulty-spec.spec.ts b/test/qqbot/plugins/bangDream/tsugu/list-difficulty-spec.spec.ts
new file mode 100644
index 0000000..e18c3ec
--- /dev/null
+++ b/test/qqbot/plugins/bangDream/tsugu/list-difficulty-spec.spec.ts
@@ -0,0 +1,51 @@
+import {
+  BANGDREAM_DIFFICULTY_LIST_SPEC,
+  createDifficultyBadgeLayout,
+  createDifficultyLevelTextSpec,
+  getDifficultyBadgeColor,
+  getDifficultyLevelTextPosition,
+  getDifficultyListCanvasWidth,
+  getDifficultyListItemX,
+} from '@/qqbot/plugins/bangDream/tsugu/render-blocks/list-difficulty-spec';
+
+describe('BangDream difficulty list spec', () => {
+  it('keeps default difficulty list dimensions stable', () => {
+    expect(BANGDREAM_DIFFICULTY_LIST_SPEC.list.defaultImageHeight).toBe(60);
+    expect(BANGDREAM_DIFFICULTY_LIST_SPEC.list.defaultSpacing).toBe(10);
+    expect(getDifficultyListCanvasWidth(5, 60, 10)).toBe(340);
+    expect(getDifficultyListItemX(3, 60, 10)).toBe(210);
+  });
+
+  it('keeps difficulty badge color fallback stable', () => {
+    expect(getDifficultyBadgeColor(1, ['#111111', '#222222'])).toBe('#222222');
+    expect(getDifficultyBadgeColor(6, ['#111111', '#222222'])).toBe(
+      '#f1f1f1',
+    );
+  });
+
+  it('keeps difficulty badge circle layout stable', () => {
+    expect(createDifficultyBadgeLayout(45)).toEqual({
+      arcEnd: Math.PI * 2,
+      arcRadius: 22.5,
+      arcStart: 0,
+      arcX: 22.5,
+      arcY: 22.5,
+      canvasHeight: 45,
+      canvasWidth: 45,
+    });
+  });
+
+  it('keeps difficulty level text layout stable', () => {
+    expect(createDifficultyLevelTextSpec(45, 26)).toEqual({
+      maxWidth: 135,
+      text: '26',
+      textSize: 30,
+    });
+    expect(getDifficultyLevelTextPosition(45, { height: 12, width: 20 })).toEqual(
+      {
+        x: 12.5,
+        y: 16.5,
+      },
+    );
+  });
+});