关键词: 信访业务系统, 工作流模型, 协同处理, 访问控制

Abstract: According to the needs of customized business workflow and information accessed security，an extensible and dynamic cooperative processing workflow model is put forward.By using this as a cord model，users can develop various additional sub models to meet their business processing requirements，such as different kinds of activities，business processing logic，rules and procedures.These sub models then form a workflow model，which can achieve information accessed security control.Using the extensible and dynamic cooperative processing workflow model，the authors develop a petition letters cooperative processing system，which introduces a dynamic workflow management technology，a workflow accessed control and coordinated processing methods based on roles and tasks，and authority monitoring control.After more than three years of use，it is proved that the system has application advantages，compared with similar systems in the market，in system maintenance，cooperative processing and monitoring control.

Key words: petition service processing system, workflow model, cooperative processing, access control