Abstract: The control system is coded in the transient analysis code CATIA, thus the logical of the control system cannot be optimized, which limits the application range of the code. Hence, the graphical modeling tool Simulink is used to model the control system, and the coupling simulation using the Simulink code and the system analysis code CATIA is finished. The computational results showed that the coupling simulation results agree well with the computational results using the system analysis code CATIA, but the modeling process of the control system with Simulink code is visual and with high efficiency. Meanwhile, the coupling method developed is extensible.