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Aiming at the research on the simulation modeling of automobile engine automatic transmission under different operating states, a modeling method based on finite state machine is proposed. This method models the different states of the vehicle during the driving phase as the migration of multi-state events. The transmission shift point map and engine working characteristic map provided by the engine manufacturer. The vehicle dynamic performance simulation model was established using Matlab / Simulink and based on Matlab/ Stateflow toolbox established a simulation model of the shifting process, which simulated the output parameter characteristics of the model under normal driving, overspeed, and braking conditions, which verified the validity of the model. The simulation results show that the established simulation model and shifting process control are consistent with the technical parameters provided by the manufacturer. The application of this simulation method avoids tedious mathematical modeling and formula derivation, and can provide reference for modeling and simulation of related engineering problems.