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General system architecture and multi- of a distributed test and control system is discussed. Then, according to specific testing and certification requirements of a new power supply system in a vehicle, architecture of a distributed test and control system is optimized. By using and improving a multi-communication mode organically, the system based on new power supply system is designed hierarchically. Functions of the system, such as data acquisition, preliminary data analysis and control instructions issuing are realized. Data exchange between the management layer and subsystems in control layer is achieved. The remote terminal in management layer can not only exhibit real time graphical display of overall system operation, but also calculate and analyze experimental data as well as storing the experimental results. It is proved that the system can fully meet testing requirements of new power supply system. At the same time, the design concept and the architecture provide some new ideas for distributed test and control systems improvement on system architecture and data exchange.