diff --git a/gateway/app.py b/gateway/app.py
index 5e60079..fe65caf 100644
--- a/gateway/app.py
+++ b/gateway/app.py
@@ -194,6 +194,7 @@ async def index():
             "if1_measure": "/static/test_interface1.html",
             "if2_hair_grow": "/static/test_interface2.html",
             "if3_hair_grow_b": "/static/test_interface3.html",
+            "if4_features": "/static/test_interface4.html",
             "if5_hairline": "/static/test_interface5.html",
         },
     }
diff --git a/static/integration.html b/static/integration.html
index 3f9d0c0..3e7e9c4 100644
--- a/static/integration.html
+++ b/static/integration.html
@@ -260,10 +260,10 @@ console.log(features['四季色彩季型']); // "冷夏型"（中文字段也保
         <tr><td>1. 四庭七眼</td><td><a href="/static/test_interface1.html" class="link">/static/test_interface1.html</a></td><td>上传照片 → 原图+标注叠加，底图/标注开关，指标卡片</td></tr>
         <tr><td>2. C端生发</td><td><a href="/static/test_interface2.html" class="link">/static/test_interface2.html</a></td><td>上传+性别 → 方案一覧（原图/叠加/生发），双图对比</td></tr>
         <tr><td>3. B端生发</td><td><a href="/static/test_interface3.html" class="link">/static/test_interface3.html</a></td><td>划线图上传 → 生发效果图</td></tr>
+        <tr><td>4. 用户特征</td><td><a href="/static/test_interface4.html" class="link">/static/test_interface4.html</a></td><td>上传照片 → 42项面部特征表格 + 原始JSON</td></tr>
         <tr><td>5. 发际线PNG</td><td><a href="/static/test_interface5.html" class="link">/static/test_interface5.html</a></td><td>上传+性别 → 发际线方案+中心点坐标</td></tr>
       </table>
       <p style="font-size:12px;color:#94a3b8;margin-top:12px">
-        接口4 无测试页（纯 JSON 返回特征字段，浏览器直接调即可查看）。
         完整 API 文档：<a href="/docs" class="link">/docs</a>（Swagger UI）
       </p>
     </div>
diff --git a/static/test_interface4.html b/static/test_interface4.html
new file mode 100644
index 0000000..2968fa0
--- /dev/null
+++ b/static/test_interface4.html
@@ -0,0 +1,196 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>接口4 — 用户特征分析 测试页</title>
+<style>
+  * { box-sizing: border-box; margin: 0; padding: 0; }
+  body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f5f5f5; color: #333; }
+  .container { max-width: 1200px; margin: 0 auto; padding: 24px; }
+  h1 { font-size: 22px; margin-bottom: 6px; }
+  .subtitle { color: #888; font-size: 13px; margin-bottom: 24px; }
+
+  .card { background: #fff; border-radius: 12px; box-shadow: 0 1px 4px rgba(0,0,0,.06); margin-bottom: 20px; }
+  .card-header { font-weight: 700; font-size: 14px; padding: 14px 18px; border-bottom: 1px solid #f0f0f0; background: #fafafa; display: flex; justify-content: space-between; align-items: center; }
+  .card-body { padding: 18px; }
+
+  .upload-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
+  .file-input { flex: 1; min-width: 200px; }
+  .file-input input[type=file] { width: 100%; padding: 8px; border: 2px dashed #ddd; border-radius: 8px; cursor: pointer; }
+  .btn { padding: 10px 28px; border: none; border-radius: 8px; font-size: 15px; cursor: pointer; font-weight: 600; transition: .2s; }
+  .btn-primary { background: #2563eb; color: #fff; }
+  .btn-primary:hover { background: #1d4ed8; }
+  .btn-primary:disabled { background: #93c5fd; cursor: not-allowed; }
+  .btn-sm { padding: 6px 14px; font-size: 13px; }
+  .btn-outline { background: #fff; border: 1px solid #d1d5db; color: #374151; }
+  .btn-outline:hover { background: #f9fafb; }
+  .hint { font-size: 12px; color: #9ca3af; margin-top: 8px; }
+
+  .status { padding: 10px 16px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; display: none; }
+  .status.info { background: #dbeafe; color: #1e40af; display: block; }
+  .status.error { background: #fee2e2; color: #991b1b; display: block; }
+  .status.success { background: #d1fae5; color: #065f46; display: block; }
+
+  .results-layout { display: flex; gap: 24px; }
+  .col-main { flex: 1.5; min-width: 0; }
+  .col-side { flex: 1; min-width: 0; }
+
+  /* 特征表格 */
+  .feat-table { width: 100%; border-collapse: collapse; font-size: 13px; }
+  .feat-table th, .feat-table td { text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; }
+  .feat-table th { background: #f8fafc; font-weight: 700; color: #475569; font-size: 11px; text-transform: uppercase; letter-spacing: .3px; }
+  .feat-table td:first-child { font-weight: 600; color: #1e293b; width: 200px; }
+  .feat-table tr:hover td { background: #f8fafc; }
+  .feat-table .highlight td { background: #eff6ff; }
+
+  /* 图片预览 */
+  .img-preview { text-align: center; }
+  .img-preview .thumb { background: #222; border-radius: 8px; overflow: hidden; display: inline-block; line-height: 0; }
+  .img-preview .thumb img { max-width: 100%; max-height: 280px; object-fit: contain; }
+
+  .json-panel { max-height: 550px; overflow: auto; }
+  .json-content { padding: 14px 16px; font-family: "SF Mono", "Fira Code", monospace; font-size: 12px; line-height: 1.6; white-space: pre-wrap; word-break: break-all; }
+
+  .hidden { display: none !important; }
+  .count-badge { background: #dbeafe; color: #1e40af; padding: 2px 10px; border-radius: 10px; font-size: 12px; font-weight: 700; }
+
+  @media (max-width: 800px) { .results-layout { flex-direction: column; } }
+</style>
+</head>
+<body>
+<div class="container">
+  <h1>🔬 接口4 — 用户特征分析 测试</h1>
+  <p class="subtitle">POST /api/v1/face/features &nbsp;|&nbsp; 上传照片 → 火山方舟豆包视觉模型 → 42项面部特征 &nbsp;|&nbsp; data.features 为 JSON 字符串</p>
+
+  <div class="card">
+    <div class="card-body">
+      <div class="upload-row">
+        <div class="file-input"><input type="file" id="imageFile" accept="image/jpeg,image/png,.jpg,.jpeg,.png"></div>
+        <button class="btn btn-primary" id="submitBtn" onclick="submitTest()">🚀 分析特征</button>
+        <button class="btn btn-outline btn-sm" onclick="clearResults()">清除</button>
+      </div>
+      <div class="hint">JPG/PNG ≤1MB 正面照 &nbsp;|&nbsp; 调用火山方舟豆包视觉模型，耗时约数秒</div>
+      <div id="statusBar" class="status hidden"></div>
+    </div>
+  </div>
+
+  <div class="results-layout hidden" id="resultsArea">
+    <div class="col-main">
+      <!-- 图片预览 -->
+      <div class="card">
+        <div class="card-header"><span>📸 上传的照片</span></div>
+        <div class="card-body img-preview">
+          <div class="thumb" id="imgPreview"><span style="color:#9ca3af;padding:40px">—</span></div>
+        </div>
+      </div>
+      <!-- 英文优先字段 -->
+      <div class="card">
+        <div class="card-header"><span>⭐ 英文优先字段</span><span id="countBadge" class="count-badge hidden"></span></div>
+        <div class="card-body" style="padding:0">
+          <table class="feat-table" id="enTable"></table>
+        </div>
+      </div>
+      <!-- 全部字段 -->
+      <div class="card">
+        <div class="card-header"><span>📋 全部特征字段</span></div>
+        <div class="card-body" style="padding:0;max-height:500px;overflow:auto">
+          <table class="feat-table" id="allTable"></table>
+        </div>
+      </div>
+    </div>
+    <div class="col-side">
+      <div class="card">
+        <div class="card-header"><span>📄 原始 JSON 响应</span><button class="btn btn-outline btn-sm" onclick="copyJson()">📋 复制</button></div>
+        <div class="json-panel"><pre class="json-content" id="jsonContent"></pre></div>
+      </div>
+    </div>
+  </div>
+</div>
+
+<script>
+const API_BASE = window.location.origin;
+
+const EN_KEYS = ['face_shape','eyebrow_shape','facial_age','dynamic_static_type','gender','gene_style'];
+const EN_LABELS = {
+  face_shape:'脸型', eyebrow_shape:'眉形', facial_age:'面部年龄',
+  dynamic_static_type:'动静类型', gender:'性别', gene_style:'基因风格'
+};
+
+function $(id) { return document.getElementById(id); }
+function setStatus(t, type) { const b=$('statusBar'); b.textContent=t; b.className='status '+type; }
+
+async function submitTest() {
+  const f = $('imageFile').files[0];
+  if (!f) { setStatus('请选择图片', 'error'); return; }
+  if (f.size > 1_000_000) { setStatus('文件超过 1 MB', 'error'); return; }
+
+  $('imgPreview').innerHTML = '<img src="'+URL.createObjectURL(f)+'" alt="preview">';
+  $('submitBtn').disabled = true; $('submitBtn').textContent = '⏳ 分析中...';
+  setStatus('⏳ 调用豆包视觉模型...', 'info'); $('resultsArea').classList.add('hidden');
+
+  const fd = new FormData(); fd.append('image_file', f);
+  try {
+    const r = await fetch(API_BASE + '/api/v1/face/features', { method:'POST', body:fd });
+    const json = await r.json();
+    $('jsonContent').textContent = JSON.stringify(json, null, 2);
+    $('resultsArea').classList.remove('hidden');
+
+    if (json.code === 0) {
+      const feats = JSON.parse(json.data.features);
+      setStatus('✅ 分析完成 — ' + Object.keys(feats).length + ' 项特征', 'success');
+      renderFeatures(feats);
+    } else {
+      setStatus('❌ code=' + json.code + ' ' + json.message, 'error');
+    }
+  } catch(e) { setStatus('❌ ' + e.message, 'error'); $('resultsArea').classList.remove('hidden'); }
+  finally { $('submitBtn').disabled = false; $('submitBtn').textContent = '🚀 分析特征'; }
+}
+
+function renderFeatures(feats) {
+  // 英文优先字段
+  let enHtml = '';
+  EN_KEYS.forEach(k => {
+    if (feats[k] !== undefined) {
+      enHtml += '<tr class="highlight"><td>'+k+'</td><td>'+EN_LABELS[k]+'</td><td>'+feats[k]+'</td></tr>';
+    }
+  });
+  $('enTable').innerHTML = enHtml;
+
+  // 全部字段
+  const allKeys = Object.keys(feats);
+  let allHtml = '';
+  allKeys.forEach(k => {
+    const isEn = EN_KEYS.includes(k);
+    allHtml += '<tr'+(isEn?' class="highlight"':'')+'><td>'+k+'</td><td>'+(isEn?EN_LABELS[k]||'':'')+'</td><td>'+feats[k]+'</td></tr>';
+  });
+  $('allTable').innerHTML = allHtml;
+
+  $('countBadge').textContent = allKeys.length + ' 项';
+  $('countBadge').classList.remove('hidden');
+}
+
+function clearResults() {
+  $('resultsArea').classList.add('hidden'); $('statusBar').className='status hidden';
+  $('imageFile').value=''; $('jsonContent').textContent='';
+  $('imgPreview').innerHTML='<span style="color:#9ca3af;padding:40px">—</span>';
+  $('enTable').innerHTML=''; $('allTable').innerHTML='';
+  $('countBadge').classList.add('hidden');
+}
+
+function copyJson() {
+  navigator.clipboard.writeText($('jsonContent').textContent).then(() => {
+    const b = event.target, o = b.textContent; b.textContent = '✅ 已复制'; setTimeout(() => b.textContent = o, 1500);
+  });
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+  const dz = $('imageFile');
+  dz.addEventListener('dragover', e => { e.preventDefault(); dz.style.borderColor='#2563eb'; });
+  dz.addEventListener('dragleave', () => dz.style.borderColor='#ddd');
+  dz.addEventListener('drop', e => { e.preventDefault(); dz.style.borderColor='#ddd'; if(e.dataTransfer.files.length){ dz.files=e.dataTransfer.files; setStatus('已选择: '+e.dataTransfer.files[0].name, 'info'); } });
+  dz.addEventListener('change', () => { if(dz.files.length) setStatus('已选择: '+dz.files[0].name, 'info'); });
+});
+</script>
+</body>
+</html>
