diff --git a/yuthon_property_approval/models/inherit_yuthon_property.py b/yuthon_property_approval/models/inherit_yuthon_property.py
index 6275fbef3..155761170 100644
--- a/yuthon_property_approval/models/inherit_yuthon_property.py
+++ b/yuthon_property_approval/models/inherit_yuthon_property.py
@@ -325,6 +325,26 @@ class PropertyBankStatements(models.Model):
             }
         }
 
+    def unbind(self):
+        statements_ids = self.env["property.bank.statements"].browse(
+            self._context.get('active_ids', self._context.get('active_id'))
+        )
+        for statement in statements_ids:
+            if statement.name:
+                bank_account = self.env['property.bank.line'].search([
+                    ('bank', '=', statement.name)
+                ])
+                if bank_account.tenant_id:
+                    # 获取需要删除的合同明细行
+                    lines_to_delete = self.env['property.tenant.line'].search([
+                        ('tenant_id', '=', bank_account.tenant_id.id),
+                        ('lease_contract_id', 'in', statement.contract_ids.ids)
+                    ])
+                    # 删除合同明细行
+                    if lines_to_delete:
+                        lines_to_delete.unlink()
+            statement.contract_ids = [(5,)]
+
     def contract_penalty(self):
         statements_ids = self.env['property.bank.statements'].search([('is_put', '=', True)])
         for record in statements_ids: