The resource flexible scheduling is the key technique in process simulation. After the introduction to the process engineering theory, the architecture of a new enterprise model was given out, which emphasizes the key of process simulating on how to control the activities according to the schedule polices under the support of the infrastructure system. It was proposed that use dynamic PERT/CPM technique to support the cooperate behavior control rules in project-oriented processes. Flexible simulation technology was introduced through the discussion about cooperate behaviors for process model to the improvement of infrastructure model, and activing technique which is used to support the hidden parallel process. The simulation algorithm was also introduced through the transforming of the five states of activity.