There are many problems in the mining of residual coal seams in the past.Modern coal mining enterprises should analyze these problems,and find a set of effective solutions based on the actual situation,and make reasonable use of coal mining technology,so as to maximize the level and safety of coal mining.The challenges faced by the mining of the residual coal seams were discussed.Based on the mining situation of the residual coal seam A,the optimal design of the working face and the application of the technology of large proportion deviation and deflection were discussed in detail,and the social and economic benefits obtained by the mining of the residual coal seam A was pointed out.