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Aiming at the requirement of pre-launch simulation test of CZ-6 Power Control and Testing system , A simulation test platform is designed according to the characteristics of short-period rapid launch and shelter operation. The test platform uses the electrical signal that simulate the power distribution valve,pressure sensor and connector hardware interface signal to form the hardware interface layer; using of software simulation of the working principle of the gas distribution platform, rocket’s connectors,and the base filling communication to form the software model layer.The hardware interface layer and the software model layer are conncected by the RS422 bus and the PC104 bus to realize modularization and combined type.The test platform composes a closed-loop test environment with CZ-6 power control and testing system.The pratice shows that all work status of CZ-6 Power Control and Testing system are met and the test efficientcy is improved.