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Satellite simulation is an important part of satellite manufacture, it can test the flying condition, performance and failure mode of any distribute system on the ground. Any way, simulation is the technology assurance of normal running.The paper researched the on-board computer simulation and testing based on PXI-BUS technology. First, the distribute systems communicated with CAN card in LabVIEW environment in PC. Through the communication between any system, display the gesture and orbit parameters in procedure algorithm, tested the validity of algorithm.Second, the distribute systems communicated in PXI-RT system with CAN card. Specially, on-board computer system and dynamic system running in the same PXI.At last, developed testing procedure in PXI. Taking full advantage of signal analysis toolbox providing by LabVIEW, testing the important parameters in on-board computer numeral simulation system, and display its’ trend and range. In this method, we can assure the reliability of algorithm, and settle the base of real satellite control system.