Abstract: The construction of sponge cities is an important measure to solve urban rain water management. However, the construction of mountain sponge cities is still in the development and exploration stage, and a comprehensive evaluation system has not been established. In view of the inadequate use of landcover type information and the lack of evaluation criteria in mountainous city construction, the combination of terrain factors, based on the types of urban surface cover and terrain factors, the paper establishes ecological evaluation indicators for mountain sponge cities. Firstly, obtain the two-temporal land type information of the study area. Then calculate the land type change detection results, and combine the elevation and slope to evaluate the regional sponge city construction. Finally, between the two time periods, the green area rate increases by 0.22%, the impervious surface rate increases by 0.46%, and the construction land developes to the middle terrain area. At the same time, the change status of the remaining land types is learned. The results show that the rate of green land in this area has increased, the protection of natural water bodies is better, the proportion of permeable surface is larger than that of impervious surface, and the development of ecological construction and construction land still conforms to the principle of mountain sponge city.

Key words: sponge city, mountain city, high-resolution remote sensing image, types of landcover