The invention discloses a vehicle control method and system. The method includes the following steps that the required torque, the rotation speed and the SOC of a power battery are received; according to the rotation speed, an engine efficient drive torque corresponding to an engine efficient region critical curve and a motor travel power generation torque corresponding to a travel power generation curve are obtained; the required torque, the engine efficient drive torque and the motor travel power generation torque are compared; if the required torque is larger than or equal to the engine efficient drive torque, a vehicle is controlled to enter in an engine drive mode; and if the SOC is smaller than a preset value and the required torque is smaller than the engine efficient drive torque and larger than the motor travel power generation torque, the vehicle is controlled to enter in a travel power generation mode. By the adoption of the method, the engine efficient drive torque corresponding to the engine efficient region critical curve and the motor travel power generation torque corresponding to the travel power generation curve are obtained according to the rotation speed, so that the vehicle is controlled to enter in the corresponding working mode, the oil saving effect and power consumption are comprehensively considered, and the vehicle works under the optimal working condition.