diff --git a/sdk/src/context.ts b/sdk/src/context.ts
index 6a9a030..557fc5d 100644
--- a/sdk/src/context.ts
+++ b/sdk/src/context.ts
@@ -1,17 +1,40 @@
-// 与 server/tracker/constants.py 的 URL_PARAM_DROP_PATTERNS 同源：
-// ("email", "phone", "mobile", "token", "key", "password", "verif")，
-// 整键精确匹配（大小写不敏感，与服务端 re.I + fullmatch 一致）——SDK 先删一遍，
-// 服务端 sanitize_url 再删一遍（双重清洗），子串参数（如 monkey 含 key）不误伤。
+// 三轨制清洗（spec §2.4）——与 server/tracker/constants.py 同源（SANITIZE_RULE_VERSION v2）：
+// ① 参数名黑名单（URL_PARAM_DROP_PATTERNS）整键精确匹配（大小写不敏感，对齐 re.I + fullmatch）
+//   → 删；子串参数（如 monkey 含 key）不误伤；
+// ② 归因白名单（ATTRIBUTION_PARAM_WHITELIST）+ utm_ 前缀 → 无条件保留；
+// ③ 其余按值判别 _SAFE_VALUE（纯数字 ≤10 位或 slug ≤31 字符）→ 保留，否则删。
+// SDK 入队前先清洗一遍，服务端 sanitize_url 再清洗一遍（双重清洗同规则，共享向量契约：
+// server/tracker/tests/fixtures/sanitize_vectors.json）。
 const URL_PARAM_DROP = new Set([
   "email",
   "phone",
   "mobile",
+  "tel",
+  "name",
+  "user",
   "token",
   "key",
   "password",
   "verif",
+  "passwd",
+  "idcard",
 ]);
 
+const ATTRIBUTION_WHITELIST = new Set([
+  "gclid",
+  "gbraid",
+  "wbraid",
+  "fbclid",
+  "msclkid",
+  "yclid",
+  "gad_source",
+  "gad_campaignid",
+  "dclid",
+]);
+
+// 对齐 server _SAFE_VALUE：^\d{1,10}|slug —— 32+ 连续字母数字视为 token 删
+const SAFE_VALUE = /^(?:\d{1,10}|[A-Za-z0-9][A-Za-z0-9._-]{0,30})$/;
+
 export interface EnvContext {
   device_type: string;
   os: string;
@@ -44,17 +67,97 @@ export interface PageContext {
   utm: Record<string, string>;
 }
 
+/** 对齐 Python unquote_plus：+ → 空格；%XX 解码（非法 % 序列 decode 抛异常 → 原样降级） */
+function unquotePlus(s: string): string {
+  if (!s.includes("+") && !s.includes("%")) return s;
+  try {
+    return decodeURIComponent(s.replace(/\+/g, " "));
+  } catch {
+    return s.replace(/\+/g, " ");
+  }
+}
+
+/** 对齐 Python urlencode 默认 quote_via=quote_plus：补齐 encodeURIComponent 差集——
+ * 空格 → +，!'()* 补编码（Python 的不转义集仅 [A-Za-z0-9_.~-]），保证输出逐字节一致 */
+function encodeParam(s: string): string {
+  return encodeURIComponent(s)
+    .replace(/%20/g, "+")
+    .replace(/[!'()*]/g, (c) => "%" + c.charCodeAt(0).toString(16).toUpperCase());
+}
+
+/** 对齐 Python parse_qsl(query, keep_blank_values=True)：
+ * & 切分、空段跳过、首 = 切分、缺 = 时值为空串 */
+function parseQuery(q: string): Array<[string, string]> {
+  const out: Array<[string, string]> = [];
+  for (const piece of q.split("&")) {
+    if (!piece) continue;
+    const eq = piece.indexOf("=");
+    out.push([
+      unquotePlus(eq === -1 ? piece : piece.slice(0, eq)),
+      unquotePlus(eq === -1 ? "" : piece.slice(eq + 1)),
+    ]);
+  }
+  return out;
+}
+
+/** authority 清洗（仅绝对 URL 调用）：剥 userinfo（末个 @ 之前，对齐 rpartition('@')）；
+ * 端口空/非纯数字/越界(>65535) → 剥除（对齐服务端 p.port 抛 ValueError 时的降级）；
+ * host 小写（对齐 p.hostname）。 */
+function cleanAuthority(authority: string): string {
+  let host = authority;
+  const at = host.lastIndexOf("@");
+  if (at !== -1) host = host.slice(at + 1);
+  // IPv6 字面量取 ] 后的 : 段；否则首个 : 段（对齐 Python partition(':')）
+  const bracketEnd = host.indexOf("]");
+  const colon = bracketEnd === -1 ? host.indexOf(":") : host.indexOf(":", bracketEnd);
+  if (colon !== -1) {
+    const port = host.slice(colon + 1);
+    if (!/^\d+$/.test(port) || +port > 65535) host = host.slice(0, colon);
+  }
+  return host.toLowerCase();
+}
+
 export function sanitizeUrl(pathAndQuery: string): string {
-  const i = pathAndQuery.indexOf("?");
-  if (i === -1) return pathAndQuery;
-  const path = pathAndQuery.slice(0, i);
-  const kept: string[] = [];
-  new URLSearchParams(pathAndQuery.slice(i + 1)).forEach((v, k) => {
-    if (!URL_PARAM_DROP.has(k.toLowerCase())) {
-      kept.push(`${encodeURIComponent(k)}=${encodeURIComponent(v)}`);
+  // 红线：pageContext 在 init 路径调用，任何异常不得冒泡——整体兜底，
+  // 降级返回剥掉 query 的 path 部分（或原串）
+  try {
+    if (typeof pathAndQuery !== "string" || pathAndQuery === "") return pathAndQuery;
+    // 先剥 fragment（# 后的一切不参与 query 解析），再切 path?query——顺序对齐 urlparse
+    const hash = pathAndQuery.indexOf("#");
+    const noFrag = hash === -1 ? pathAndQuery : pathAndQuery.slice(0, hash);
+    // 相对路径（SDK 主场景 location.pathname+search）不走 new URL——无 origin 会抛，
+    // 沿用字符串切分；仅 ^https?:// 绝对 URL（如 referrer）才重塑 authority
+    let base = "";
+    let pathQuery = noFrag;
+    const abs = /^(https?:\/\/)([^/?]*)([\s\S]*)$/i.exec(noFrag);
+    if (abs) {
+      base = abs[1].toLowerCase() + cleanAuthority(abs[2]);
+      pathQuery = abs[3];
     }
-  });
-  return kept.length ? `${path}?${kept.join("&")}` : path;
+    const q = pathQuery.indexOf("?");
+    const path = q === -1 ? pathQuery : pathQuery.slice(0, q);
+    const query = q === -1 ? "" : pathQuery.slice(q + 1);
+    const kept: string[] = [];
+    for (const [k, v] of parseQuery(query)) {
+      const lk = k.toLowerCase();
+      if (URL_PARAM_DROP.has(lk)) continue; // 轨①：黑名单整键删
+      if (ATTRIBUTION_WHITELIST.has(lk) || lk.startsWith("utm_")) {
+        // 轨②：归因白名单无条件保留
+        kept.push(`${encodeParam(k)}=${encodeParam(v)}`);
+        continue;
+      }
+      if (SAFE_VALUE.test(v)) kept.push(`${encodeParam(k)}=${encodeParam(v)}`); // 轨③：按值判别
+    }
+    const qs = kept.join("&");
+    return qs ? `${base}${path}?${qs}` : `${base}${path}`;
+  } catch {
+    try {
+      const i = pathAndQuery.indexOf("?");
+      return i === -1 ? pathAndQuery : pathAndQuery.slice(0, i);
+    } catch {
+      return pathAndQuery;
+    }
+  }
 }
 
 export function parseUtm(search: string): Record<string, string> {
diff --git a/sdk/test/context.test.ts b/sdk/test/context.test.ts
index f8df130..0ad86a8 100644
--- a/sdk/test/context.test.ts
+++ b/sdk/test/context.test.ts
@@ -1,4 +1,5 @@
 import { describe, it, expect, afterEach, vi } from "vitest";
+import vectors from "../../server/tracker/tests/fixtures/sanitize_vectors.json";
 import {
   buildEnvContext,
   collectHighEntropyHints,
@@ -58,14 +59,21 @@ describe("parseUtm", () => {
 });
 
 describe("sanitizeUrl", () => {
+  // 共享向量（T1 落地）：server/tracker/tests/fixtures/sanitize_vectors.json 是双侧唯一契约
+  // ——SDK 与 server/tracker/services/validation.py 的 sanitize_url 必须逐字节同输出。
+  // `in` 是保留字不能作解构绑定名，用整对象参数 v 取属性。
+  it.each(vectors.vectors)("共享向量: $in", (v) => {
+    expect(sanitizeUrl(v.in)).toBe(v.out);
+  });
+
   it("删除黑名单参数，保留其余（含空值），不误伤 monkey", () => {
     expect(sanitizeUrl("/p?email=a@b.com&token=x&id=3&utm_source=g&monkey=1")).toBe(
       "/p?id=3&utm_source=g&monkey=1",
     );
   });
 
-  it("空值参数保留", () => {
-    expect(sanitizeUrl("/p?empty=&id=1")).toBe("/p?empty=&id=1");
+  it("空值参数按值判别删（_SAFE_VALUE 不匹配空串，对齐服务端）", () => {
+    expect(sanitizeUrl("/p?empty=&id=1")).toBe("/p?id=1");
   });
 
   it("黑名单整键精确匹配（大小写不敏感），子串参数不删", () => {
diff --git a/sdk/tsconfig.json b/sdk/tsconfig.json
index 77f6b7a..577e6f6 100644
--- a/sdk/tsconfig.json
+++ b/sdk/tsconfig.json
@@ -8,6 +8,7 @@
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
     "noEmit": true
   },
   "include": ["src", "test"]