Numerical simulation of shock pressure prcfiles through PMMA gap was carried out using the hydrodynamic code AUTODYN®-2D and the results were compared with the experimental results. The result of the numerical analysis showed higher peak pressure than the experimental values as the gap length increased. Difrerences were considered as due to the curvature of the detonation front and its two dimensional flow which was assumed as one dimensional in the experiments. Furthermore the longer duration of shock pressure in the simulation might have a1so the influence of the disagreement.