Abstract: In the process of side-wall coal mining, the rock mass of slope undergoes complex mechanical evolution, which involves the change of original rock stress, the extension of deformation failure zone, the stability of slope and so on. Therefore, it is very important to choose proper mining direction and effective control measures for the stability of side slope. In view of the above problems, we propose two schemes to control the stability of side slope, which is backfill pressure foot and partial backfill in reverse slope. The results show that the deformation, failure and stability of side-slope coal are related to the direction of mining, and the strength and depth of rock mass failure area are weaker than that of reverse-slope coal mining, and the overall stability is better, the stability of the mining slope in reverse slope will attenuate, resulting in the shear instability of the flat plate, and the length of the working face is smaller than that of the mining along slope, so the mining along slope is better than that in reverse slope according to the development and stability of the slope deformation and failure area of the two stoping schemes, the backfilling foot and the local backfilling scheme are proposed to control the slope stability, the backfilling foot can change the original structure shape of the slope, so that the movement of the rock mass inside the slope can be alleviated, and the development of the failure area can be controlled, it can effectively support the deformed rock mass inside the slope, restrain theextension of the failure area, slow down the failure caused by the working face, and finally control the stability of the slope.