a hybrid power transmission integrated system includes a first planetary gear train , a second planetary gear train , a first transmission - connecting set and a second transmission - connecting set . a control method includes : arranging the first transmission - connecting set to provide a first power input end ; arranging the second transmission - connecting set to provide a second power input end , a first power output end and a free transmission end ; connecting the first and second transmission - connecting sets to the first and second planetary gear trains ; controlling the free transmission end performed as a second power output end or a third power input end such that powers are converted via the second power output end and are stored ; supplying the stored power to the hybrid power transmission integrated system via the second or third power input end .