Focus on the problems of square metal sheet encasement, this paper proposes a heuristic algorithm which imitates the hominine packing process. This algorithm is able to realize tiered encasement of a wooden box, starting from the bottom layer to upper ones. And in each layer, it can intelligently fill the unevenness to improve the space utilization of the wooden box. By using this intelligent processing approach for metal sheet encasement, we conclude the encasement results which reveal that the present algorithm is both of effectiveness and certain versatility.