In view of the problems of long line, low terminal voltage and poor reliability in remote mountainous areas, an effective way is to make full use of local renewable energy and build microgrid. In this paper, the existing problems of Liannan power grid and pilot line are analyzed, and the reconstruction scheme of microgrid with photovoltaic and energy storage is proposed. In the process of practice, the ‘three-phase unbalance governance’，the ‘accurate fault location of overhead line’，and the ‘intelligent inspection of power channel and power equipment’，are further adopted to improve power supply quality. The investment estimation and effect analysis of the proposed scheme are carried out. The results show that the proposed scheme can significantly improve the power quality and supply reliability, and deal with the disordered access of distributed generation, which has the value of popularization and application.