For the low-speed booming noise problem of rear-wheel drive cars, the excitation sources,transfer paths and peak generating mechanism of booming noise are comprehensively analyzed with transfer path analysis and modal experimental methods. The excitation force mainly comes from torsional alternating moments of the final drive input, which acts on the rear axle in the form of a bearing reaction force, then transmits to the interior. The combined effects of multiple resonances result in peaks of 1102r/min and 1515r/min, but the resonant structures are different. Based on the aforementioned analyses, various measurements to reduce interior noise by reducing the torsional alternating moment are proposed, and a comprehensive evaluation is given. Verification experiments of better noise reduction measurements are carried out. The results show that the measurements are effective at reducing booming noise by up to 15dB, and that the research provides a new idea for solving similar problems.