The method of analyzing capability and verifying correctness for workflow process is divided in static check and dynamic simulation. The focus of the paper is to test and analyze workflow process by means of dynamic simulation, further to confirm that a process will do appropriate things at appropriate time by appropriate resources. The paper will research some key issues in process simulation——setting up simulation environment, the algorithm for arranging events in a queue based on path coverage rule, analyzing simulation results. It adopts interactive and non-interactive means and makes use of white-box and black-box methods to test workflow process on the base of high coverage rate. At last the classification, distribution and trend of process defects will be presented by various simulation results.