A driving system for an electric vehicle, comprising: a wheel including a wheel rim rotatable about an axis and a tire fitted around the rim; a motor at least partially positioned within a space defined by the wheel rim, the motor comprising a motor housing including a main body and an end cover attached to the main body, a stator disposed fixedly within the motor housing, a rotor disposed rotatably within a central space defined by the stator, and a first output shaft fixed onto the rotor, wherein the first output shaft is hollow, and wherein the first output shaft is supported rotatably at two ends by a first pair of bearings (13a, 13b) disposed in the main body and the end cover of the motor housing, respectively, so that the rotor mounted fixedly onto the first output shaft is disposed rotatably within a central space defined by the stator; the driving system further comprising a gearbox which comprises a gearbox housing comprising a main body and an end cover attached to the main body; a first pair of gears (21a, 21b) engaged with each other, a second pair of gears (23a, 23b) engaged with each other, a transmission shaft supported rotatably at two ends by a second pair of bearings (29a, 29b) disposed in the main body of the gearbox housing and the end cover of the gearbox housing, respectively, and a second output shaft which is drivingly attached to the wheel rim at its second end and extends through the first output shaft so that the second output shaft is disposed coaxially with the first output shaft, wherein the second output shaft protrudes out of the first output shaft; wherein the first output shaft is capable of driving the second output shaft to rotate by engagement of gears of the gearbox; wherein the first output shaft extends into the gearbox housing so that a gear having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft; wherein a gear having a larger diameter of the second pair of gears of the at least two pair of gears is fixed onto a first end of the second output shaft supported rotatably, the first end of the second output shaft being opposite to the second end; wherein the other gears of the at least two pair of gears are fixed onto the transmission shaft; and wherein the wheel rim and the gear box are positioned on opposite axial sides of the motor; and the driving system further comprising a brake to enable stopping the wheel; characterized in that the second output shaft is drivingly attached to the wheel rim by means of an adaptor, the brake is fitted onto the adaptor, and the brake is arranged on an axial side of the wheel rim opposite to a side where the gearbox and the motor housing are arranged. a motor at least partially positioned within a space defined by the wheel rim, the motor comprising a motor housing including a main body and an end cover attached to the main body, a stator disposed fixedly within the motor housing, a rotor disposed rotatably within a central space defined by the stator, and a first output shaft fixed onto the rotor, wherein the first output shaft is hollow, and wherein the first output shaft is supported rotatably at two ends by a first pair of bearings (13a, 13b) disposed in the main body and the end cover of the motor housing, respectively, so that the rotor mounted fixedly onto the first output shaft is disposed rotatably within a central space defined by the stator; the driving system further comprising a gearbox which comprises a gearbox housing comprising a main body and an end cover attached to the main body; a first pair of gears (21a, 21b) engaged with each other, a second pair of gears (23a, 23b) engaged with each other, a transmission shaft supported rotatably at two ends by a second pair of bearings (29a, 29b) disposed in the main body of the gearbox housing and the end cover of the gearbox housing, respectively, and a second output shaft which is drivingly attached to the wheel rim at its second end and extends through the first output shaft so that the second output shaft is disposed coaxially with the first output shaft, wherein the second output shaft protrudes out of the first output shaft; wherein the first output shaft is capable of driving the second output shaft to rotate by engagement of gears of the gearbox; wherein the first output shaft extends into the gearbox housing so that a gear having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft; wherein a gear having a larger diameter of the second pair of gears of the at least two pair of gears is fixed onto a first end of the second output shaft supported rotatably, the first end of the second output shaft being opposite to the second end; wherein the other gears of the at least two pair of gears are fixed onto the transmission shaft; and wherein the wheel rim and the gear box are positioned on opposite axial sides of the motor; and the driving system further comprising a brake to enable stopping the wheel; characterized in that the second output shaft is drivingly attached to the wheel rim by means of an adaptor, the brake is fitted onto the adaptor, and the brake is arranged on an axial side of the wheel rim opposite to a side where the gearbox and the motor housing are arranged.