Abstract: Taking Dabaodang survey area of Yushen Coal Mining Area as study area, according to the regional geological occurrence conditions and typical drillings data, the influence laws of the rock-soil ratio impacting the mining subsidence is researched with the method of numerical simulation under the same geological conditions and mining technology. The results show that: in different depth levels, the subsidence coefficient could decrease with the increase of the rock-soil ratio, and the change process of the rock-soil ratio impacting subsidence coefficient is different; in the different depth levels, with the increase of the rock-soil ratio, this influence extent presents the trend of becoming larger firstly and then smaller, and becomes largest generally while the rock-soil ratio is from 4∶1 to 8∶1. According to the results of numerical simulation, the giant thick soil that is more than 100 m could cut down the subsidence coefficient.