Abstract: Pointing out that method for solving the information system is a minimization problem of two-dimensional, attribute value that the dfiniting on row and compositing on column intensity is maxima was defined as the limiting value of granular, logic operation of granular comput on the preferred degree of logic independence with it stage by stage, finally minimization granular (rules) sets is got.Unifies the algorithm soluting for the nformation system on theory and the experiments show that it is efficienal.