Abstract: Compared with turbocharger, the advantages of pressure wave supercharger (PWS) are most lie in its excellent acceleration and emission performance. Meanwhile after gaining the good acceleration and emission performance, the crucial goal is to improve power performance of PWS. In order to make it, some change on engine inlet system have been adopted. Also an experiment of inlet pipe was made to testify the effect. The research results show that the power performance of PWS diesel engine has been improved satistied..