The principle of the regenerative braking energy of automobile is introduced. Three types of the regenerative braking system, i.e., energy accumulator of the flywheel, hydraulic pressure and electrochemistry, are discussed. 介绍了汽车制动能量再生原理,分析了飞轮储能、液压储能和电化学储能三种汽车制动能量再生方法。