A power-driven system for a vehicle, comprising: an engine; a plurality of input shafts (21, 22), the engine being configured to selectively engage with at least one of the plurality of input shafts (21, 22), a gear-position driving gear being arranged on each input shaft (21, 22); a plurality of output shafts (31, 32), a gear-position driven gear being arranged on each output shaft (31, 32), the gear-position driven gears correspondingly meshing with the gear-position driving gears; a first motor power shaft, a motor power shaft first gear being arranged on the first motor power shaft, the motor power shaft first gear and the plurality of output shafts (31, 32) linking with a differential of the vehicle respectively; a second motor power shaft, a motor power shaft second gear being arranged on the second motor power shaft, the motor power shaft second gear linking with one gear-position driven gear; a transfer gear, configured to selectively engage with the motor power shaft first gear to link with the motor power shaft first gear, and selectively engage with the motor power shaft second gear to link with the motor power shaft second gear; a first motor generator, configured to link with the transfer gear; a motor power shaft third gear configured to mesh with the transfer gear; and a first motor power shaft synchronizer for engaging the motor power shaft third gear with the first motor power shaft, characterized in that the motor power shaft third gear is freely sleeved on the first motor power shaft and in that the first motor power shaft synchronizer is arranged on the first motor power shaft. an engine; a plurality of input shafts (21, 22), the engine being configured to selectively engage with at least one of the plurality of input shafts (21, 22), a gear-position driving gear being arranged on each input shaft (21, 22); a plurality of output shafts (31, 32), a gear-position driven gear being arranged on each output shaft (31, 32), the gear-position driven gears correspondingly meshing with the gear-position driving gears; a first motor power shaft, a motor power shaft first gear being arranged on the first motor power shaft, the motor power shaft first gear and the plurality of output shafts (31, 32) linking with a differential of the vehicle respectively; a second motor power shaft, a motor power shaft second gear being arranged on the second motor power shaft, the motor power shaft second gear linking with one gear-position driven gear; a transfer gear, configured to selectively engage with the motor power shaft first gear to link with the motor power shaft first gear, and selectively engage with the motor power shaft second gear to link with the motor power shaft second gear; a first motor generator, configured to link with the transfer gear; a motor power shaft third gear configured to mesh with the transfer gear; and a first motor power shaft synchronizer for engaging the motor power shaft third gear with the first motor power shaft, characterized in that the motor power shaft third gear is freely sleeved on the first motor power shaft and in that the first motor power shaft synchronizer is arranged on the first motor power shaft.