diff --git a/packages/domain/entities.py b/packages/domain/entities.py
index fd9baa7ea..95bb6db0c 100644
--- a/packages/domain/entities.py
+++ b/packages/domain/entities.py
@@ -41,6 +41,14 @@ class Workspace:
     id: str
     name: str
     owner_user_id: str
+    # 订阅相关字段
+    subscription_plan: str = "free"  # free, pro, enterprise
+    subscription_status: str = "active"  # active, cancelled, expired
+    subscription_expires_at: datetime | None = None
+    # 配额限制
+    max_projects: int = 3  # free: 3, pro: unlimited, enterprise: unlimited
+    max_storage_gb: int = 10  # free: 10, pro: 100, enterprise: 1000
+    used_storage_gb: float = 0.0
     created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))