In order to improve and precisely evaluate the performance of extended-range electric vehicle (E-REV), the parameter of transmission was designed and matched, according to the performance demands of an E-REV. By means of Advisor, the models of battery and motor were modified and optimized, the control strategy was modeled and simulated, the efficient working area and the optimal working area of engine were also solved, switching control logic relation was built in the paper. The performance of the E-REV was researched under CYC_1015 condition. The results show the dynamic and economic performance is improved. Maximum speed is over 140 km/h, fuel-saving rate reaches 37%. The peak torque of motor reaches 170Nm, working efficiency remains around 82.8%, increased by 3%. The working efficiency of engine remains around 19.4%, increased by 29%, the amount of HC, CO and NOx emissions are decreased by 75%, 69.3% and 100% respectively.