In order to implement Sanquan education policy,a scheme is put forward to reconstruct the student affairs system of engineering students in universities using the backward-design principle under the guidance of engineering education accreditation standards.With the aid of this scheme,the goal to optimize education activities concerning student affairs can be achieved.Many details of the reconstruction procedure are offered,such as confirming program outcome,establishing activity-outcome matrix,setting activity objectives,to implementation plans,carrying out assessment,and continuous improvement;in addition,the practical method is demonstrated by the case of student social practice.The scheme proposed here is likely to be a valuable reference to refine education mechanism and improve student affairs system in the background of engineering education accreditation.