AbstractThe equation of state of detonation products is essential to the explosive application. The study of this paper is set up with the following procedures: (1) cylinder expansion test is performed in a detonation test chamber, and the radial expansion, varied with time, of copper tube which is filled with Composition B, is recorded by Hamamatsu streak camera, (2) the JWL parameters are obtained by means of a simple mathematical analysis, and (3) the 2DL Code has been modified using JWL equation of state instead of HOM equation of state to study the behavior of the detonation gases. The results show that the JWL parameters of this study are in close agreement with the LLNL's approach and the JWL equation of state can more accurately predict the behavior of detonation products than the HOM.