Abstract: In this paper,the one dimensional non-steady flow theory is applied to the computation of exhaust pressure wave for mediumsized or small-sized diesel engines. The program of exhaust wave described in FORTRAN has been used for the multiple scheme computations for 115 type single cylinder turbocharged diesel. The various structure parameters of the exhaust system obtained from the computations have an effecting regularity on the shape of exhaust pressure wave and the property of engine conforming to the theoretical analysis⁽¹⁾,that proves the program's reliability.