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Range-extender electric vehicle (RE-EV) is a new type of new energy vehicle which fills the gap between the conventional internal-combustion engine vehicle and the electric vehicle.It is the most possibility to be the industrialization product and to enter the common families at present stage. The method of parameter matching is designed. According to the structural features of powertrain system and the control targets, the key parts of powertrain system for RE-EV has been matched based on Suzuki Alto internal-combustion vehicle. The results showed that:the rated voltage of the motor was 60V, the maximum speed was 4 000 r/min, the rated power was 8kW, the rated torque was 40.43N·m, the peak power was 11kW, the maximum torque was 80.86 N·m; the range extender using the Mahler range extender and inline two cylinder four stroke engine; the power battery using lithium iron phosphate battery, and the single group rated capacity was 80Ah and the total voltage was 96V. It has engineering significance to the overall design, function enhancement and optimization and safety improvement, and also to the Electric Vehicle and its integrated chassis control system development.