An electric power split hybrid system comprises a case, a linkage unit, an electric power part, and a switching part. An engine, a generator, a motor, and a transmission mechanism are installed in the case. The generator is used to start the engine, and is capable of adjusting a torque of the engine and of generating electricity via driving of the engine. The transmission mechanism is used to link and move a wheel to rotate. The linkage unit is used to link and move the engine and the motor. The electric power part is used to store electrical energy generated by the generator and to supply electric power to the motor. The switching part is connected to the generator, the motor, and the electric power part. Electric power generated by the generator is switched by the switching part to supply to one of the motor and the electric power part.