BPEL can automate orchestrations for crossorganizational web services; however, it meets a serious challenge from modeling human-intensive business activities, especially from addressing access control for human coordination considering complex interpersonal relationship in modern business. This paper analyzes the importance of human-intensive processes and introduces several additional types of BPEL constructs, then discusses RBAC Model extracted from BPEL process, finally uses improved FOAF to enhance RBAC Model in BPEL. The goal of our work is to enhance human coordination capability in BPEL-based business processes by using RBAC model and improved FOAF.