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In this paper pre-transmission coupled parallel hybrid electric vehicle (PHEV) dynamic system energy control structural model is built according to the development requirement of hybrid electric light off-road vehicles and the vehicle's dynamic system form, based on the model a whole vehicle driving dynamics model is built in order to research the dynamic performance and fuel economy. The engine test bench testing data are fitted using of extreme value theory and surface fitting method, and the engine universal characteristic curves and OOL mathematic model are built. Besides, driving induction motor mathematic model and driving battery SOC mathematic model are built. Then vehicle dynamics is simulated according to the least fuel consumption and battery charging and discharging balance energy distributing rule. The simulation result indicated the least engine fuel consumption as well as battery balance. The accuracy of models is proved by the vehicle's road tests according to proposed control method.