Abstract: Mountainous areas are regions with a high incidence of natural disasters such as lightning strikes and icing, which affect the power supply reliability of rural distribution networks in mountainous areas. Therefore, a construction method of a distribution network auxiliary planning system considering the impact of mountain disasters is proposed. Taking the construction of the distribution network in Wencheng mountainous area as the starting point, it penetrates through the business center, measurement center, data center and other grid environment centers to obtain real-time information such as lightning monitoring data and user load data. Through the analysis of the characteristics of natural disasters such as lightning strikes in Wencheng County, the complementary ability of regional clean energy and the weak points of the distribution network, an equipment-level distribution network planning scheme with mountain characteristics is generated to assist and guide the automatic distribution network planning. Through digital means, the supply situation of clean energy in the mountain distribution network can be analyzed, the reliability and recovery ability of energy supply after disasters can be evaluated, and the safe operation and power supply reliability of the distribution network can be improved.