With the rapid development of innovative computer technology, the computing environment of the workflow has become distributed and heterogeneous. Security management of WMS becomes weak. And the possibility of security leak will increased. The important information and the data are threatened more and more seriously. The security problem of workflow has become the hot spot in current research institutions and organizations concerned. Role-based access control model (RBAC) simplifies the permit management. It also reflects the access control mechanism in the organization and the enterprises. So the RBAC is very popular to design the workflow. In this paper, we present the multi access control security model based on roles. We propose the implicit and explicit authority management based on the roles. These measures enforce the security of this mode in computer environment. The first part of this paper is the introduction of the related problem. The second part is the concept of access control based on role. The third part is the multi access control security model based on roles. Then, the final part is the authority management.