The invention relates to an energy management method for an electric quantity maintaining stage of an external charge type hybrid vehicle, which comprises the following steps: designing integrated control curves of each shift according to an optimal fuel economy curve of an engine of a target vehicle and the speed ratio of a speed changer; and designing a control method of the shifts of the speedchanger, the opening of an electronic air throttle of the engine and the torque of a motor by using the opening of an accelerator pedal, the vehicle speed and the charge state value of a storage battery as control parameters. The method can control the electronic air throttle of the engine, the torque of the motor and the shifts of the speed changer in real time so as to ensure that the engine canrun along an optimal efficiency curve. When the advantages of high transmission efficiency, low cost, and the like of an electric control type automatic transmission are exerted, the control effect of a conventional stepless transmission is realized, and the defects of complicated manufacturing process, high manufacturing cost, low strength of a transmission belt, short service life, and the likeare also avoided.