diff --git a/tauri-app/src-tauri/dmg-background.png b/tauri-app/src-tauri/dmg-background.png
new file mode 100644
index 0000000..41f8a31
Binary files /dev/null and b/tauri-app/src-tauri/dmg-background.png differ
diff --git a/tauri-app/src-tauri/generate-dmg-bg.py b/tauri-app/src-tauri/generate-dmg-bg.py
new file mode 100644
index 0000000..56ec0f0
--- /dev/null
+++ b/tauri-app/src-tauri/generate-dmg-bg.py
@@ -0,0 +1,156 @@
+#!/usr/bin/env python3
+"""
+生成 DMG 背景图 — 美家卡智影设计规范
+====================================
+
+画布: 660 x 400 px
+风格: 与应用 UI 一致（绿色品牌色、卡片阴影、圆角）
+"""
+
+import subprocess
+from pathlib import Path
+from PIL import Image, ImageDraw, ImageFont
+
+# ──────────────────────────── 配置 ────────────────────────────
+W, H = 660, 400
+
+# 颜色（引用应用 CSS 变量）
+BG = (249, 250, 251)          # --bg-main: #f9fafb
+CARD_BG = (255, 255, 255)     # --bg-card: #fff
+PRIMARY = (54, 178, 106)      # --primary: #36b26a
+TEXT_PRIMARY = (17, 24, 39)   # --text-primary: #111827
+TEXT_SECONDARY = (107, 114, 128)  # --text-secondary: #6b7280
+TEXT_TERTIARY = (156, 163, 175)   # --text-tertiary: #9ca3af
+BORDER = (229, 231, 235)      # --border-color: #e5e7eb
+SUCCESS = (16, 185, 129)      # --success: #10b981
+
+# 阴影（模拟 CSS box-shadow）
+def draw_card_shadow(draw, bbox, color=(0, 0, 0), alpha=0.05, blur=8):
+    """绘制卡片阴影"""
+    x1, y1, x2, y2 = bbox
+    for i in range(blur, 0, -1):
+        a = int(alpha * 255 * (i / blur))
+        offset = blur - i + 2
+        draw.rounded_rectangle(
+            [x1 - offset, y1 - offset + 2, x2 + offset, y2 + offset + 4],
+            radius=12,
+            fill=(0, 0, 0, a),
+        )
+
+# ──────────────────────────── 字体 ────────────────────────────
+def get_font(size, bold=False):
+    """获取中文字体"""
+    result = subprocess.run(
+        ["fc-match", "-f", "%{file}", "PingFang SC"],
+        capture_output=True, text=True
+    )
+    path = result.stdout.strip()
+    if path and Path(path).exists():
+        idx = 2 if bold else 0  # 常规/粗体索引
+        return ImageFont.truetype(path, size, index=idx)
+    return ImageFont.load_default()
+
+font_title = get_font(22, bold=True)
+font_subtitle = get_font(13, bold=True)
+font_body = get_font(12)
+font_caption = get_font(10)
+
+# ──────────────────────────── 画布 ────────────────────────────
+bg = Image.new("RGBA", (W, H), (*BG, 255))
+draw = ImageDraw.Draw(bg)
+
+# ──────────────────────────── 顶部品牌区 ────────────────────────────
+# 加载 Logo（绿色 M）
+logo = Image.open("icons/icon.png").convert("RGBA")
+logo_size = 36
+logo.thumbnail((logo_size, logo_size), Image.LANCZOS)
+
+# 放置 Logo（顶部居中偏左，与文字搭配）
+logo_x = (W - logo_size) // 2 - 70
+logo_y = 28
+bg.paste(logo, (logo_x, logo_y), logo)
+
+# 品牌名称
+draw.text((logo_x + logo_size + 10, logo_y + 6), "美家卡智影",
+          fill=TEXT_PRIMARY, font=font_title)
+
+# ──────────────────────────── 中部拖拽引导 ────────────────────────────
+# 拖拽箭头（从左侧指向右侧）
+arrow_y = 195
+arrow_start = 220
+arrow_end = 440
+arrow_mid = (arrow_start + arrow_end) // 2
+
+# 虚线箭头身
+dash_len = 6
+gap_len = 4
+current = arrow_start
+while current < arrow_end - 10:
+    seg = min(dash_len, arrow_end - 10 - current)
+    draw.line([(current, arrow_y), (current + seg, arrow_y)],
+              fill=PRIMARY, width=2)
+    current += dash_len + gap_len
+
+# 箭头头部
+draw.polygon([(arrow_end, arrow_y), (arrow_end - 8, arrow_y - 4),
+              (arrow_end - 8, arrow_y + 4)], fill=PRIMARY)
+
+# 引导文字
+draw.text((W // 2, arrow_y + 18), "将左侧图标拖拽到右侧 Applications 文件夹",
+          fill=TEXT_SECONDARY, font=font_body, anchor="mm")
+
+# ──────────────────────────── 底部提示卡片 ────────────────────────────
+card_w = 420
+card_h = 110
+card_x = (W - card_w) // 2
+card_y = 245
+radius = 12
+
+# 卡片阴影（多层模拟）
+shadow = Image.new("RGBA", (W, H), (0, 0, 0, 0))
+shadow_draw = ImageDraw.Draw(shadow)
+for i in range(6, 0, -1):
+    a = int(0.04 * 255 * (i / 6))
+    offset = 8 - i
+    shadow_draw.rounded_rectangle(
+        [card_x - offset, card_y - offset + 2,
+         card_x + card_w + offset, card_y + card_h + offset + 4],
+        radius=radius, fill=(0, 0, 0, a)
+    )
+bg = Image.alpha_composite(bg, shadow)
+draw = ImageDraw.Draw(bg)
+
+# 卡片本体
+draw.rounded_rectangle(
+    [card_x, card_y, card_x + card_w, card_y + card_h],
+    radius=radius, fill=CARD_BG, outline=BORDER, width=1
+)
+
+# 左侧绿色竖条（强调色）
+bar_w = 4
+draw.rounded_rectangle(
+    [card_x, card_y + 16, card_x + bar_w, card_y + card_h - 16],
+    radius=bar_w // 2, fill=PRIMARY
+)
+
+# 提示标题（绿色）
+draw.text((card_x + 20, card_y + 14), "首次安装提示",
+          fill=PRIMARY, font=font_subtitle)
+
+# 提示正文
+tip_lines = [
+    "由于未注册 Apple 开发者，首次打开时可能会被系统拦截",
+    "请右键点击应用图标，选择「打开」，或在系统设置中允许",
+]
+for i, line in enumerate(tip_lines):
+    draw.text((card_x + 20, card_y + 38 + i * 18), line,
+              fill=TEXT_SECONDARY, font=font_body)
+
+# ──────────────────────────── 底部版本号 ────────────────────────────
+draw.text((W // 2, H - 16), "v1.5.18",
+          fill=TEXT_TERTIARY, font=font_caption, anchor="mm")
+
+# ──────────────────────────── 保存 ────────────────────────────
+output = bg.convert("RGB")
+output.save("dmg-background.png", "PNG")
+print("✅ Generated: tauri-app/src-tauri/dmg-background.png (660x400)")
diff --git a/tauri-app/src-tauri/tauri.conf.json b/tauri-app/src-tauri/tauri.conf.json
index 8e92b7c..2f8f23c 100644
--- a/tauri-app/src-tauri/tauri.conf.json
+++ b/tauri-app/src-tauri/tauri.conf.json
@@ -70,7 +70,22 @@
     ],
     "macOS": {
       "minimumSystemVersion": "13.0",
-      "infoPlist": "Info.plist"
+      "infoPlist": "Info.plist",
+      "dmg": {
+        "background": "dmg-background.png",
+        "windowSize": {
+          "width": 660,
+          "height": 400
+        },
+        "appPosition": {
+          "x": 180,
+          "y": 170
+        },
+        "applicationFolderPosition": {
+          "x": 480,
+          "y": 170
+        }
+      }
     },
     "windows": {
       "nsis": {