Taking internal students of vocational college as research sample, this paper utilizes basic theory of rough sets to discuss problems of discretization and reduction process in the application of rough sets. On the basis of knowledge discovery, it proposes and designs a type of college students’ network research system model based on rough sets exploring the basic thoughts of applying network management method to do analysis on network behavior. Experimental results indicate that the college students’ network research system model which is based on rough sets keeps obvious effects on entropy discretization algorithm and genetic reduction algorithm.