The invention provides an air conditioner control method and system and an air conditioner. The air conditioner control method comprises the steps that when the refrigeration operation duration of theair conditioner reaches a preset duration, whether the distance between an outdoor unit and a fixed obstacle is smaller than a preset distance or not is judged; when the distance between the outdoorunit and the fixed obstacle is smaller than the preset distance, whether the current condensation saturability of a condenser and current output parameters of the air conditioner meet preset conditions or not is judged; and when the current condensation saturability and the current output parameters meet the preset conditions, the air conditioner is controlled to operate according to preset outputparameters. According to the air conditioner control method and system and the air conditioner, capability attenuation after the air conditioner outdoor unit is mounted in a narrow space is reduced,and the adaptability to the mounting space of the air conditioner is improved.