In view of the security risks existing in the traditional imperfect maintenance of the power grid model in terms of verification， a model maintaining mechanism is proposed and implemented that is capable of improving the operation safety and stability of online system operation by modifying the model offline. After verification in a test environment， the modified model is put into the model maintenance mechanism of the online system. Also provided are the flow management interface， customized validation rules， task rollback and multi-user parallel processing mechanism characterized by safety， flexibility and efficiency.