Abstract : Transfer path analysis (TPA) is an effective method for structure vibration performance optimization, evaluation and fault diagnosis. The basic theory and characteristic of TPA method is mainly described in the paper. The experiment system is established for TPA method to verify the TPA method. Comparison of simulation calculation value with experiment value shows that simulation result and experiment result are basically consistent. TPA method is used in four improved structures separately and reasonable structure is confirmed. The analytical results showed that the TPA method is a good way to find the vibration transmission path which provides the evidences to control the vibration transmission effectively.