In order to reduce the capital cost and environmental risk of shale gas exploration and development and realize green development, it is necessary to evaluate the terrain suitability for shale gas development zones. Four terrain evaluation indexes are selected, and the evaluation method of terrain suitability for shale gas development block is established using mean change-point analysis method, entropy weight method and GIS spatial analysis technology. The results show that highest and higher suitability areas are mostly distributed in the southwest part of Zhaotong city, namely the east and north of Zhaoyang district and Ludian county, while medium suitability areas are widely distributed in the whole block, mostly presented as sporadic small pieces. The lowest and lower suitable areas are mainly distributed in fold shape along the landform alternating zone, and are clustered in Qiaojia county, the west of Ludian county, and the west and north of Yongshan county. The terrain suitability of Zhaotong block is mainly medium suitability. Upon this evaluation method,879 large areas of the highest suitability were selected in zhaotong block to provide reference for site selection in shale gas development.