This paper focuses on the vehicle compressor.Firstly，the characteristics of flow field and broadband noise of compressors are calculated based on the steady state RANS equations，and the results demonstrate that the main noise source of the compressor locates in the impeller areas.Then，based on the large eddy simulation (LES) and Ffowcs - Williams & Hawkings (FW-H) equation of the acoustic analogy method，the compressor discrete noise is predicted，taking the compressor impeller as the main noise source.The results show that the main noise source of compressor locates in compressor impeller areas.In addition，by means of simulation，the sound pressure varies approximately in the same trend with the experiment value，taking compressor impeller as the main noise source.The simulation value is slightly greater than the experimental value with the error less than 10%.Therefore，it is concluded that the simulation calculation method is feasible，which provides the reference value for further study on the vehicle compressors.