<p>Aiming at the problems of long test cycle of classical transfer path analysis method and low test accuracy of operating condition-based transfer path analysis method, as well as the unique NVH challenges faced by electric vehicles (EVs) such as unmasked structure-borne road noise and complex vibration transfer paths derived from powertrain electrification, a method of interior structure-borne road noise diagnosis which can take into account both test efficiency and test accuracy. Based on the tested noise transfer function (NTF) and the acceleration admittance data at the car body attachment point, the acceleration-sound pressure transfer relationship of each path of the car body was obtained, and combined with the acceleration frequency response at the car body attachment point under operating conditions, the sound pressure of the vehicle structure-borne road noise was synthesized, and the total sound pressure was evaluated. The contribution of each path’s sound pressure response to the total sound pressure response is studied, and the main transmission path of 56&#xa0;Hz peak noise is identified by combining NTF and modal analysis method. The feasibility and effectiveness of the method are verified by experiments: first, the main transmission path of peak noise is accurately predicted through the proposed sound pressure synthesis method; then, targeted modification is carried out based on the prediction result; finally, the peak noise is reduced by 4.19 dB(A).</p>