Aiming at the problem of task assignment in Workflow Management System(WfMS), this paper presents a strategy for task assignment which supports load balance of task actors and experiential value, and bridges the gap between roles and task actors. On the basis of predicting the load of task actors, the strategy takes the following factors into account: the working load of task actors, the quality achieved by them and their interest of different categories of tasks. According to the prediction of load deviation, the load of task actors is divi...