diff --git a/shopxo/app/plugins/vr_ticket/service/BaseService.php b/shopxo/app/plugins/vr_ticket/service/BaseService.php
index 36dc1e3..509a914 100644
--- a/shopxo/app/plugins/vr_ticket/service/BaseService.php
+++ b/shopxo/app/plugins/vr_ticket/service/BaseService.php
@@ -364,9 +364,8 @@ class BaseService
             $R = $R_new;
         }
 
-        // 合并为36bit整数
+        // 合并为 base36 字符串
         $result = ($L & 0x7FFFF) | (($R & 0x1FFFF) << 17);
-
         return base_convert($result, 10, 36);
     }
 
@@ -401,15 +400,15 @@ class BaseService
     /**
      * 生成短码
      *
-     * 编码结构：【明文4位 goods_id】【混淆5位 ticket_id】→ 短码
-     * - 前4位：goods_id 明文 base36 (范围 0-1,679,615)
-     * - 后5位：ticket_id 经 Feistel8 混淆 (范围 0-60,466,175)
-     * - 解码 O(1)：直接读前4位=goods_id，用key解密后5位=ticket_id
+     * 编码结构：【明文4位 goods_id】【变长混淆 ticket_id】
+     * - 前4位：goods_id 明文 base36，固定4位（范围 0-1,679,615）
+     * - 后部：ticket_id 可变长度 base36，随 ticket_id 增长自动变长
+     * - 解码 O(1)：前4位=goods_id，剩余全部=ticket_id（无需固定分隔）
      *
      * @param int $goods_id 0-1679615
-     * @param int $ticket_id 0-60466175
-     * @return string base36小写短码（9位）
-     * @throws \Exception 参数超范围时抛出
+     * @param int $ticket_id 任意正整数（可变长度）
+     * @return string base36短码
+     * @throws \Exception goods_id 超范围时抛出
      */
     public static function shortCodeEncode(int $goods_id, int $ticket_id): string
     {
@@ -417,35 +416,35 @@ class BaseService
         if ($goods_id > 0xFFFFFF) {
             throw new \Exception("goods_id 超出范围 (max=1679615), given={$goods_id}");
         }
-        // 校验 ticket_id 不超过 5位 base36 (0x3FFFFFFF = 1073741823)
-        if ($ticket_id > 0x3FFFFFFF) {
-            throw new \Exception("ticket_id 超出范围 (max=1073741823), given={$ticket_id}");
+        if ($ticket_id <= 0) {
+            throw new \Exception("ticket_id 必须为正整数, given={$ticket_id}");
         }
 
         // goods_id 固定4位 base36（明文）
         $goods_part = str_pad(base_convert($goods_id, 10, 36), 4, '0', STR_PAD_LEFT);
 
+
+        // ticket_id 可变长度（不填充）
+        $ticket_part = base_convert($ticket_id, 10, 36);
+
         // ticket_id 混淆
-        // ticket_id 填满5位 base36，用 Feistel8 混淆
-        $ticket_int = intval(str_pad(base_convert($ticket_id, 10, 36), 5, '0', STR_PAD_LEFT), 36);
+        $ticket_int = intval($ticket_part, 36);
         $key = self::getGoodsKey($goods_id);
         $obfuscated = self::feistelEncode($ticket_int, $key);
-        // 确保混淆结果也是5位
-        $ticket_part = str_pad($obfuscated, 5, '0', STR_PAD_LEFT);
 
-        // 拼接：前4位明文 goods_id + 后5位混淆 ticket_id
-        return strtolower($goods_part . $ticket_part);
+        // 拼接：前4位明文 goods_id + 变长混淆 ticket_id
+        return strtolower($goods_part . $obfuscated);
     }
 
     /**
      * 解析短码（解码回 goods_id + ticket_id）
      *
-     * 解码结构：【明文4位 goods_id】【混淆5位 ticket_id】
+     * 解码结构：【明文4位 goods_id】【变长混淆 ticket_id】
      * - 前4位：直接 base36_decode = goods_id
-     * - 后5位：用 goods_id 派生 key → Feistel 解密 = ticket_id
+     * - 剩余全部：用 goods_id 派生 key → Feistel 解密 = ticket_id
      * - 解码 O(1)，无暴力搜索
      *
-     * @param string $code 短码（小写或大写均可，9位）
+     * @param string $code 短码（小写或大写均可）
      * @param int|null $goods_id_hint 可选提示（已不需要，用于兼容）
      * @return array ['goods_id' => int, 'ticket_id' => int]
      * @throws \Exception 解码失败时抛出
@@ -453,7 +452,6 @@ class BaseService
     public static function shortCodeDecode(string $code, ?int $goods_id_hint = null): array
     {
         $code = strtolower($code);
-
         // 前4位：明文 goods_id
         $goods_part = substr($code, 0, 4);
         $goods_id = intval($goods_part, 36);
@@ -466,17 +464,11 @@ class BaseService
         // 用 goods_id 派生 key
         $key = self::getGoodsKey($goods_id);
 
-        // 后5位：混淆的 ticket_id → Feistel 解密
-        $ticket_part = substr($code, 4, 5);
+        // 后部：变长混淆 ticket_id → Feistel 解密
+        $ticket_part = substr($code, 4);
         $ticket_int = self::feistelDecode($ticket_part, $key);
-        // 转回字符串确保5位，然后 decode
-        $ticket_id = intval(str_pad(base_convert($ticket_int, 10, 36), 5, '0', STR_PAD_LEFT), 36);
-
-        return [
-            'goods_id'  => $goods_id,
-            'ticket_id' => $ticket_id,
-        ];
-    }
+        // 转回 base36 字符串（不填充）
+        $ticket_id = intval(base_convert($ticket_int, 10, 36), 36);
 
     /**
      * 签名 QR payload（HMAC-SHA256 防篡改）
diff --git a/tests/phase4_1_feistel_test.php b/tests/phase4_1_feistel_test.php
index 33ac448..4b13768 100644
--- a/tests/phase4_1_feistel_test.php
+++ b/tests/phase4_1_feistel_test.php
@@ -82,22 +82,23 @@ function shortCodeEncode(int $goods_id, int $ticket_id): string
     if ($goods_id > 0xFFFFFF) {
         throw new Exception("goods_id 超出范围 (max=1679615), given={$goods_id}");
     }
-    // 校验 ticket_id 不超过 5位 base36 (0x3FFFFFFF = 1073741823)
-    if ($ticket_id > 0x3FFFFFFF) {
-        throw new Exception("ticket_id 超出范围 (max=1073741823), given={$ticket_id}");
+    if ($ticket_id <= 0) {
+        throw new Exception("ticket_id 必须为正整数, given={$ticket_id}");
     }
 
     // goods_id 固定4位 base36（明文）
     $goods_part = str_pad(base_convert($goods_id, 10, 36), 4, '0', STR_PAD_LEFT);
 
+    // ticket_id 可变长度（不填充）
+    $ticket_part = base_convert($ticket_id, 10, 36);
+
     // ticket_id 混淆
-    $ticket_int = intval(str_pad(base_convert($ticket_id, 10, 36), 5, '0', STR_PAD_LEFT), 36);
+    $ticket_int = intval($ticket_part, 36);
     $key = getGoodsKey($goods_id);
     $obfuscated = feistelEncode($ticket_int, $key);
-    $ticket_part = str_pad($obfuscated, 5, '0', STR_PAD_LEFT);
 
-    // 拼接：前4位明文 goods_id + 后5位混淆 ticket_id
-    return strtolower($goods_part . $ticket_part);
+    // 拼接：前4位明文 goods_id + 变长混淆 ticket_id
+    return strtolower($goods_part . $obfuscated);
 }
 
 function shortCodeDecode(string $code, ?int $goods_id_hint = null): array
@@ -116,10 +117,10 @@ function shortCodeDecode(string $code, ?int $goods_id_hint = null): array
     // 用 goods_id 派生 key
     $key = getGoodsKey($goods_id);
 
-    // 后5位：混淆的 ticket_id → Feistel 解密
-    $ticket_part = substr($code, 4, 5);
+    // 后部：变长混淆 ticket_id → Feistel 解密
+    $ticket_part = substr($code, 4);
     $ticket_int = feistelDecode($ticket_part, $key);
-    $ticket_id = intval(str_pad(base_convert($ticket_int, 10, 36), 5, '0', STR_PAD_LEFT), 36);
+    $ticket_id = intval(base_convert($ticket_int, 10, 36), 36);
 
     return ['goods_id' => $goods_id, 'ticket_id' => $ticket_id];
 }
@@ -259,18 +260,8 @@ $expired_signed = signQrPayload($expired_payload);
 $verified = verifyQrPayload($expired_signed);
 assert_true($verified === null, "QR过期测试: 已过期应返回null");
 
-// Test 7: 边界条件 - ticket_id 超出5位 base36
+// Test 7: goods_id 超出4位 base36
 echo "\n--- 边界条件测试 ---\n";
-try {
-    shortCodeEncode(118, 1073741824); // 超出5位 base36
-    echo "❌ FAIL: ticket_id超出范围应抛出异常\n";
-    $failed++;
-} catch (Exception $e) {
-    echo "✅ PASS: ticket_id超出范围正确抛出异常\n";
-    $passed++;
-}
-
-// Test 7b: goods_id 超出4位 base36
 try {
     shortCodeEncode(2000000, 100); // goods_id=2000000 > 1679615
     echo "❌ FAIL: goods_id超出范围应抛出异常\n";
@@ -280,6 +271,16 @@ try {
     $passed++;
 }
 
+// Test 7b: ticket_id 最小值
+try {
+    shortCodeEncode(118, 0); // ticket_id=0 无效
+    echo "❌ FAIL: ticket_id=0应抛出异常\n";
+    $failed++;
+} catch (Exception $e) {
+    echo "✅ PASS: ticket_id=0正确抛出异常\n";
+    $passed++;
+}
+
 // Test 7c: 默认密钥异常
 echo "\n--- 默认密钥异常测试 ---\n";
 // 临时清除环境变量
@@ -299,12 +300,13 @@ try {
     putenv("VR_TICKET_SECRET={$orig_secret}");
 }
 
-// Test 8: ticket_id 最大5位 base36值
-$max_ticket = 1073741823; // 0x3FFFFFFF
-$code = shortCodeEncode(118, $max_ticket);
+// Test 8: ticket_id 变长（展示不受5位限制）
+$big_ticket = 1000000000; // 10亿
+$code = shortCodeEncode(118, $big_ticket);
+echo "短码长度: " . strlen($code) . " 位\n";
 $decoded = shortCodeDecode($code);
-assert_equals(118, $decoded['goods_id'], "最大ticket_id: goods_id");
-assert_equals($max_ticket, $decoded['ticket_id'], "最大ticket_id: ticket_id = 1073741823");
+assert_equals(118, $decoded['goods_id'], "大变长ticket_id: goods_id");
+assert_equals($big_ticket, $decoded['ticket_id'], "大变长ticket_id: ticket_id = 1000000000");
 
 // Test 9: 不同商品 key 不同
 echo "\n--- Per-goods key 隔离测试 ---\n";