diff --git a/game/enemies/BossVP.ts b/game/enemies/BossVP.ts
index 4a16965..ea531a1 100644
--- a/game/enemies/BossVP.ts
+++ b/game/enemies/BossVP.ts
@@ -14,9 +14,9 @@ export class BossVP extends EnemyBase {
   ) {
     super(scene, pathPoints, 800, 40, 30, 150, 'enemy-boss')
     this.onDestroyTower = onDestroyTower
-    // 放大 BOSS
-    const bossScale = Math.min(this.cellW, this.cellH) / 128 * 1.3
-    this.imageSprite.setScale(bossScale)
+    // BOSS 放大到 1.3 个格子（跨格的威压感）
+    const bossSize = this.cellW * 1.3
+    this.imageSprite.setDisplaySize(bossSize, bossSize)
     this.imageSprite.setDepth(12)
     // BOSS 出现特效
     scene.cameras.main.flash(800, 255, 0, 0, false)
diff --git a/game/enemies/EnemyBase.ts b/game/enemies/EnemyBase.ts
index 78747bb..17a2315 100644
--- a/game/enemies/EnemyBase.ts
+++ b/game/enemies/EnemyBase.ts
@@ -87,10 +87,10 @@ export abstract class EnemyBase {
       this.y = pathPoints[0].y
     }
 
-    // 用 AI 图片精灵，尺寸按格子缩放
+    // 用 AI 图片精灵，精确设为格子尺寸的 75%（怪物比塔小一点）
+    const enemySize = cellW * 0.75
     this.imageSprite = scene.add.image(this.x, this.y, spriteKey)
-    const scale = Math.min(cellW, cellH) / 128 * 0.75
-    this.imageSprite.setScale(scale)
+    this.imageSprite.setDisplaySize(enemySize, enemySize)
     this.imageSprite.setDepth(10)
 
     this.healthBar = scene.add.graphics()
diff --git a/game/enemies/OldEmployee.ts b/game/enemies/OldEmployee.ts
index fccb464..fd2bc2e 100644
--- a/game/enemies/OldEmployee.ts
+++ b/game/enemies/OldEmployee.ts
@@ -6,9 +6,8 @@ export class OldEmployee extends EnemyBase {
   constructor(scene: Phaser.Scene, pathPoints: PathPoint[]) {
     super(scene, pathPoints, 150, 50, 8, 30, 'enemy-old')
     this.shieldCount = 3
-    // 老员工图片稍大
-    const scale = Math.min(this.cellW, this.cellH) / 128 * 0.9
-    this.imageSprite.setScale(scale)
+    // 老员工比普通怪略大（0.85 个格子）
+    this.imageSprite.setDisplaySize(this.cellW * 0.85, this.cellW * 0.85)
   }
 
   getQuote(): string { return getRandomQuote('OldEmployee') }
diff --git a/game/mapRenderer.ts b/game/mapRenderer.ts
index 6b7fb71..bbee42e 100644
--- a/game/mapRenderer.ts
+++ b/game/mapRenderer.ts
@@ -3,6 +3,7 @@ import {
   MAP_COLS,
   MAP_ROWS,
   GAME_WIDTH,
+  GAME_HEIGHT,
   HUD_HEIGHT,
   PATH_WAYPOINTS,
   COLOR_PATH,
@@ -36,11 +37,12 @@ export function buildPathTiles(
 
 export const PATH_TILES = buildPathTiles(PATH_WAYPOINTS)
 
-/** 计算格子尺寸 */
+/** 计算格子尺寸（正方形格子，取宽高中较小值保证正方形） */
 export function getCellSize() {
-  const cellW = Math.floor(GAME_WIDTH / MAP_COLS)
-  const cellH = Math.floor((720 - HUD_HEIGHT) / MAP_ROWS)
-  return { cellW, cellH }
+  const rawW = Math.floor(GAME_WIDTH / MAP_COLS)          // 80
+  const rawH = Math.floor((GAME_HEIGHT - HUD_HEIGHT) / MAP_ROWS) // 55
+  const cell = Math.min(rawW, rawH)                        // 55 → 正方形
+  return { cellW: cell, cellH: cell }
 }
 
 /**
diff --git a/game/towers/TowerBase.ts b/game/towers/TowerBase.ts
index 4e7af0a..345a4ac 100644
--- a/game/towers/TowerBase.ts
+++ b/game/towers/TowerBase.ts
@@ -56,10 +56,10 @@ export abstract class TowerBase {
     this.px = gridX * cellW + cellW / 2
     this.py = HUD_HEIGHT + gridY * cellH + cellH / 2
 
-    // 用 AI 图片作为精灵
+    // 用 AI 图片作为精灵，精确设为格子尺寸的 85%（留边距）
+    const imgSize = cellW * 0.85
     this.imageSprite = scene.add.image(this.px, this.py, spriteKey)
-    const scale = Math.min(cellW, cellH) / 128 * 0.85
-    this.imageSprite.setScale(scale)
+    this.imageSprite.setDisplaySize(imgSize, imgSize)
     this.imageSprite.setDepth(10)
 
     this.staminaBar = scene.add.graphics()