diff --git a/backend/app/models/models.py b/backend/app/models/models.py
index d9fb5c1cb..e9f96663d 100644
--- a/backend/app/models/models.py
+++ b/backend/app/models/models.py
@@ -3,7 +3,6 @@ from datetime import datetime
 import enum
 
 from sqlalchemy import Column, String, DateTime, Integer, Text, CHAR, SmallInteger, Numeric
-from sqlalchemy.orm import relationship
 
 from app.core.database import Base
 
@@ -2174,7 +2173,6 @@ class BizProductionWorkOrder(Base):
     update_time = Column(DateTime, nullable=False, default=datetime.now, onupdate=datetime.now, comment="更新时间")
     del_flag = Column(SmallInteger, nullable=False, default=0, comment="删除标记")
 
-    tasks = relationship("BizProductionTask", backref="work_order", lazy="dynamic")
 
 
 class BizProductionTask(Base):
@@ -2202,7 +2200,6 @@ class BizProductionTask(Base):
     update_time = Column(DateTime, nullable=False, default=datetime.now, onupdate=datetime.now, comment="更新时间")
     del_flag = Column(SmallInteger, nullable=False, default=0, comment="删除标记")
 
-    steps = relationship("BizProductionTaskStep", backref="task", lazy="dynamic")
 
 
 class BizProductionTaskInput(Base):