In view of the decentralization of various self-designed grid equipment maintenance management systems， an advanced province-district-county integrated grid equipment maintenance management system is designed and realized. As an important part of grid dispatching operation management system（OMS）， based on the unified basic platform and management of maintenance workflow， supported by the data exchange system PX2000 and N-tier system structure， the system realizes the reviewing and permission flow of grid equipment maintenance and monthly electric maintenance plan between different parts. The system has been applied in Jiangsu and proved available in the practical projects.