Abstract: Process mining is helpful for deploying new business processes as well as auditing, analyzing and improving the already enacted ones. I}he following text will solve the problem in dealing with invisible tasks,such tasks that exist in a process model but not in its event log. This is a problem since invisible tasks are mainly used for routing purpose but must not be ignored. Analyzed the features of strong-loop,weak-loop,jump and invisible tasks,on the basis of which a new algorithm was proposed. This algorithm can improve the efficiency of the mining of invisible tasks.

Key words: Task, Invisible, Jump, Loop, Mining