The invention discloses a power system control method. The power system control method comprises the following steps of connecting a clutch, i.e. when rotation speed difference exists between a first part and a second part of the clutch, adjusting the rotation speed of a first power source to reduce the rotation speed difference of the clutch, and after judging that the adjustment on the rotation speed of the first power source is finished, connecting the clutch; the step of adjusting the rotation speed of the first power source comprises the following step of adjusting the torque of an engine according to a first change rate, wherein the absolute value of the first change rate is in positive correlation with the rotation speed of a first motor. By the method, the adjustment on the rotation speed of the first power source can be finished within the shortest time, smooth connection of the clutch is realized, a good operation experience is provided, the clutch can be taken as a simple power switch, and abrasion caused by slipping control is prevented.