To verify the accuracy of modal simulation analysis for a commercial vehicle exhaust system, a finite element (FE) model of the system was established using FE software. Modal simulation was performed on the FE model to obtain multiple orders of modal frequencies, mode shapes, and other parameters. A real-vehicle modal test was then conducted on the same exhaust system. The test results were compared with the simulation results. The comparison shows that the first-order modal frequency from simulation is 59.586 Hz, which is very close to the experimentally measured value of 58.008 Hz, thereby validating the reliability and accuracy of the simulation method. This provides a basis for shortening the subsequent development cycle and reducing costs.