The invention provides a driving system of a hybrid vehicle. The driving system comprises an engine (1), a first electric motor (2) which is in mechanical connection with the engine (1), a second electric motor (4) which is connected with the first electric machine (2) through a first clutch (3), a differential mechanism (6) which is connected with the output end of the second electric motor (4) as well as a battery (5) which is electrically connected with the first electric motor (2) and the second electric motor (4), wherein the first clutch (3) is an overrunning clutch. Because the first clutch (3) is an overrunning clutch, the hybrid vehicle can be driven independently by the second electric motor (4), or can be jointly driven by the engine (1) and/or the first electric motor (2) and the second electric motor (4) without controlling the overrunning clutch. Therefore, the operation is simplified. In addition, the volume of the overrunning clutch is relatively smaller, thereby ensuring that the hybrid vehicle has a more compact structure.