Abstract:Based on the lightning disaster data from 2009 to 2018 and digital elevation data of Inner Mongolia, the influence and weight of terrain factors on lightning disaster were analyzed by mathematical statistics and entropy method. The results show that in the past 21 years, the lightning disaster spots in Inner Mongolia were mainly distributed in the range of elevation between 200 m and 2000m, and there were basically no lightning disasters above 2000m,the number of lightning disaster points decreases exponentially with the increase of slope and topographic relief. The lightning disaster points were mainly distributed in the areas with slope less than 10° and were mostly distributed in the topographic relief interval of 0-75m, From the perspective of slope upward, the number of lightning disaster points on the south slope was the highest (accounting for 45.53%), and the number of lightning disaster points on the north slope was the lowest. The elevation of 0-500m, the slope of 15 ° -35 °, the topographic relief of 0-20m and on the southwest slope and flat land the probability of lightning disaster are higher in different classifications of terrain factors. The entropy method was used to analyze the weights of lightning disasters caused by different topographic factors such as elevation, topographic relief, slope and slope direction. The results of this study have some guiding significance for lightning hazard risk zoning and defense planning.