Motor torque control method and system and vehicle

The invention provides a motor torque control method and system and a vehicle, and belongs to the field of motor control. The motor torque control method comprises the steps that: when the conditions that a vehicle enters a downhill state, a brake pedal and an accelerator pedal are not stepped down and the vehicle is free of faults are met at the same time, the target output torque of a motor of the vehicle is set to be 0 and sent to the motor, so that the motor outputs torque according to the target output torque; when the vehicle speed of the vehicle is larger than a speed threshold value and the duration of the slope of a ramp where the vehicle is located is larger than a slope threshold value reaches a preset duration value, the motor is controlled to stop outputting the target output torque, meanwhile, the target recovery torque of the motor is determined and sent to the motor, and therefore, the motor conducts energy recovery according to the target recovery torque, the speed threshold value is determin