The invention provides a vehicle controlling method and system and a vehicle. The vehicle controlling method comprises the steps that traffic information sent by a server is received after the automatic driving function is started by the vehicle; the road condition is identified according to the traffic information; remaining power of a power battery is obtained; a target driving mode corresponding to the traffic information is obtained from the corresponding relationship of the preset road condition and the driving mode according to the remaining power, wherein the vehicle comprises a plurality of driving modes; and the vehicle is controlled to switch to the target driving mode. According to the vehicle controlling method and system and the vehicle, driving safety of the vehicle can be improved, and energy consumption and pollution discharging of the vehicle can further be reduced effectively.