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

摘要： 根据可定制业务流程和信息安全访问控制的需求，提出了一种可扩展动态工作流的协同处理模型。用户可以按照任务处理环节的需求以工作流子模型为核心定制任务中的活动类型和业务处理逻辑，定制各种附加子模型的业务知识与规则，并将基于角色和任务的访问控制运用于模型中，实现安全访问控制的工作流建模。利用该模型，研发了信访业务协同处理系统，介绍了系统的动态工作流管理技术、基于角色和任务的工作流访问控制与协调处理方法、以及基于任务授权控制的监控机制。三年多的应用情况证明，该系统在系统维护、协同处理、以及监控异常方面，具有应用优势。

关键词: 信访业务系统, 工作流模型, 协同处理, 访问控制