diff --git a/convert-w2p.js b/convert-w2p.js
index d2ce2f6..e2b0fa7 100644
--- a/convert-w2p.js
+++ b/convert-w2p.js
@@ -261,7 +261,7 @@ function collectObjects(nodeId, ctx, processed) {
  * @param {Object} input  web-to-pixso 格式的 JSON 对象
  * @returns {Object}      html2pptx Schema JSON 对象
  */
-function convert(input) {
+async function convert(input) {
   if (!input || !input.nodes) {
     throw new Error('无效输入：缺少 "nodes" 字段');
   }
@@ -272,6 +272,57 @@ function convert(input) {
   }
 
   const canvas = input.canvas || {};
+
+  // ===== 图片下载：RECTANGLE+IMG 标签且无 backgroundImages 时，从 src URL 下载 =====
+  const pageUrl = input.source?.url || '';
+  const https = require('https');
+  const http = require('http');
+
+  function downloadImage(url) {
+    return new Promise(function(resolve) {
+      try {
+        var mod = url.startsWith('https') ? https : http;
+        mod.get(url, { timeout: 5000 }, function(res) {
+          if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
+            downloadImage(res.headers.location).then(resolve);
+            return;
+          }
+          var chunks = [];
+          res.on('data', function(c) { chunks.push(c); });
+          res.on('end', function() {
+            var buf = Buffer.concat(chunks);
+            var b64 = 'data:image/png;base64,' + buf.toString('base64');
+            resolve(b64);
+          });
+          res.on('error', function() { resolve(null); });
+        }).on('error', function() { resolve(null); });
+      } catch (e) { resolve(null); }
+    });
+  }
+
+  async function fetchNodeImages(node) {
+    if (!node) return;
+    if (node.tag === 'IMG' && node.attributes?.src && (!node.backgroundImages || node.backgroundImages.length === 0)) {
+      var src = node.attributes.src;
+      // 拼接完整 URL：相对路径基于 origin，绝对路径基于 origin
+      var origin = pageUrl.replace(/^(https?:\/\/[^\/]+).*/, '$1');
+      if (src.startsWith('/')) src = origin + src;
+      else if (!src.startsWith('http')) src = pageUrl.replace(/\/[^\/]*$/, '/') + src;
+      console.log('📥 下载图片: ' + src);
+      var data = await downloadImage(src);
+      if (data) {
+        if (!input.assets) input.assets = {};
+        var key = 'img-' + (node.id || Math.random().toString(36).slice(2));
+        input.assets[key] = { data: data };
+        node.backgroundImages = [key];
+        node.type = 'IMAGE'; // 标记为 IMAGE 类型
+      }
+    }
+    if (node.children) for (var c of node.children) await fetchNodeImages(c);
+  }
+
+  // 异步下载所有图片
+  await fetchNodeImages(inputRoot);
   // 如果没有 canvas 信息则默认 1920×1080（16:9 常见尺寸）
   const canvasWidth = canvas.width || 1920;
   const canvasHeight = canvas.height || 1080;
@@ -293,6 +344,7 @@ function convert(input) {
         rect: { x: nr.x - slideX, y: nr.y - slideY, w: rw, h: rh },
         styles: node.styles || {}, src: node.src || node.text || '',
         layerGroup: node.layerGroup || '',
+        backgroundImages: node.backgroundImages,
         parentW: parentW || rw,
         _depth: depth
       });
@@ -578,15 +630,15 @@ function convert(input) {
       return za - zb;
     });
 
-    // ===== 同坐标完全重叠去重：保留后者（高层） =====
+    // ===== 同坐标完全重叠去重：保留后者（高层），仅同类型 =====
     var seen = {};
     var overlapRemove = new Set();
     for (var i = sg.children.length - 1; i >= 0; i--) {
       var ci = sg.children[i];
       if (!ci.rect) continue;
-      var key = Math.round(ci.rect.x) + ',' + Math.round(ci.rect.y) + ',' + Math.round(ci.rect.w) + ',' + Math.round(ci.rect.h);
+      var key = ci.type + ',' + Math.round(ci.rect.x) + ',' + Math.round(ci.rect.y) + ',' + Math.round(ci.rect.w) + ',' + Math.round(ci.rect.h);
       if (seen[key]) {
-        overlapRemove.add(ci.id); // 后出现的（更高层）保留，前面的移除
+        overlapRemove.add(ci.id);
       } else {
         seen[key] = true;
       }
@@ -881,6 +933,7 @@ function convert(input) {
 // ============================================================
 
 if (require.main === module) {
+(async function() {
   const args = process.argv.slice(2);
 
   if (args.length < 1) {
@@ -912,7 +965,7 @@ if (require.main === module) {
 
   // 执行转换并写入
   try {
-    const result = convert(inputJson);
+    const result = await convert(inputJson);
     console.log('result slides:', result.slides.length, 'first objects:', result.slides[0]?.objects?.length);
     
     // 渲染 PPTX（支持自定义布局）
@@ -975,6 +1028,7 @@ if (require.main === module) {
     console.error('❌ 转换失败:', err.message);
     process.exit(1);
   }
+})();
 }
 
 module.exports = { convert };