In order to solve the problems of trajectory calculation and real-time dynamicly showing the results in trajectory simulation, a method of combination object-oriented with Petri net is used in simulaion modeling and simulation management of trajectory simulation, that effectively solves the prolem of trajectory calculation; the method of using the Vega visualization technology to show the trajectory data lets the results and visual display combinate well. The simulation results show that the object-oriented Petri net and visualization technology proposed here well solve the problems of trajectory calculation and visual display of data. And this also has a good reference for the simulation of other dynamic complex systems.