Abstract: Several simulated models about the engine, battery and electric motor of hybrid electric vehicles un2 der normal condition were built. The controlling strategies of hybrid electric vehicles under normal condition were built. The controlling strategies of several different kinds of electric vehicleswere analyzed. According to simulated results, hybrid2electric hybrid vehicleswere selected to conduct op timized design, and the results show that the hy2 brid2electric hybrid vehicles are low fuel consump tion, low emission and energy conservation, which p rovides the reference for further studying the energy management of hybrid2electric hybrid vehicles.