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Bus-integrated computers have a wide range of applications in the aerospace field. But few of them use Saber for simulation modeling of bus-integrated computers. Using Saber modeling, it is possible to target device level, subsystem level and supersystem simulation, which facilitates faster development iterations and shorter development time. To address this issue, this paper first uses Saber to model its peripheral circuits for bus-integrated computers. The model mainly contains power supply module, filter module, I/O interface, and CAN bus interface. After that, the constant power load model is used to abstract the rest parts of the bus-integrated computer. By running the simulation, the effect of the model of the peripheral circuit on the constant power load is compared when it works and does not work, the parameters of the inductor in the system are corrected, and the voltage stability of the DC-DC converter is verified by feedback, which effectively improves the efficiency of the design iteration.