Abstract: In this paper, the Computational methods for determing the D-set defined in [1] are Considered, particularly, for the,D-set presented in [2] with more practical value, we give a efficient algorithm and discuss its mathematical principle and implement procedure. Otherwise, Some simple properties aboutδ((P_i^s_i)(i=1,2,…,K)are described and a numerical example .to show the correctness of the procedure is given.