Abstract: Operational transfer path analysis (OTPA) method has high efficiency for road noise analysis, but when the related excitation source acts on the system at the same time or the strong coupling exists between the transmission paths, the solution of the transmissibility matrix will be severely deviated, and the accuracy cannot be guaranteed. Aiming at the problem of simultaneous action of excitation sources, a method of simulating structural load of road noise based on a test bench is proposed. In this method, the structural load of road noise acting on the vehicle is controlled by a vibration exciter, and the column full rank matrix of the reference response signal can be obtained in less working condition data, and then the transmissibility matrix is solved. By using the test bench, which is optimized by the finite element simulation and verified by test in advance, and the automobile chassis dynamometer as excitation sources respectively, two sets of tests are arranged in the hemi-anechoic laboratory. The test results show that the coherence function curves of the two excitation methods in the frequency range of 50-400 Hz are very close and their values are close to 1 within the majority of the frequency range. Moreover, the transmissibility curves obtained by the two excitation methods are in good agreement in the same frequency range, indicating that the proposed method can simulate the structural load of road noise well.