Automobile noise reduction method and system

The invention provides an automobile noise reduction method and system. The method comprises the steps that according to road test data and modal test data of a current automobile, target frequency correspondingly generated when the current automobile is accelerated and roars is determined; a target optimization scheme of the local structure of the vehicle body front bumper beam is formulated based on the overall structure of the vehicle body front bumper beam in the current vehicle and the target frequency, wherein the target optimization scheme comprises optimization parameters and optimization parts; and carrying out CAE simulation analysis according to the target optimization scheme so as to carry out test verification. In this way, on the premise that only the vehicle body front bumper beam is locally optimized, the problem that coupling resonance of the inherent frequency of the vehicle body front bumper beam and the excitation frequency of the engine generates roaring noise can be effectively solved, t