diff --git a/backend/app/Entity/Parse/EntityParseFactory.php b/backend/app/Entity/Parse/EntityParseFactory.php
index 56019ac..1ae50fc 100644
--- a/backend/app/Entity/Parse/EntityParseFactory.php
+++ b/backend/app/Entity/Parse/EntityParseFactory.php
@@ -121,11 +121,11 @@ class EntityParseFactory
             throw new InvalidArgumentException('Invalid message body: expected JSON array');
         }
 
-        // 2. 从 data 中提取 platform_id
-        if (!isset($data['platform_id'])) {
+        // 2. 从 meta 中提取 platform_id
+        if (!isset($data['meta']['platform_id'])) {
             throw new InvalidArgumentException('Missing required field: platform_id');
         }
-        $platformId = (int) $data['platform_id'];
+        $platformId = (int) $data['meta']['platform_id'];
 
         // 3. 如果未指定实体类型，从 routing key 中提取
         if ($entityType === null) {