The invention discloses a vehicle control method and system and belongs to the technical field of vehicle active safety. The vehicle control system is arranged on a first vehicle and comprises radar and a processing unit. The radar is used for emitting radar signals to a second vehicle, and the second vehicle is located in front of the first vehicle. The radar is further used for receiving echo signals fed back by the second vehicle according to the radar signals, confirming state information of the first vehicle according to the radar signals and the echo signals and sending the state information of the first vehicle to the processing unit. The processing unit is used for judging whether the first vehicle meets a braking condition or not according to the state information of the first vehicle, and the first vehicle is controlled to be braked when meeting the braking condition. By the adoption of the method and system, the problem that a rear-end collision accident of the first vehicle and the second vehicle is likely to happen when the second vehicle suddenly stops traveling is solved, the rear-end collision accident happening when the second vehicle suddenly stops traveling is prevented, and the method and system are used for vehicle control.