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Most of composite materials are made by sintering method. In this research, in order to make composite material for magnetic refrigeration, we carried out several experiments for the powder consolidation using the shock compaction method and numerical analysis for the behavior of underwater shock wave. The shock compaction method is to consolidate metal powder using underwater shock wave including an ultra-high pressure and high velocity generated by detonation of explosive. Generally, the magnitude of peak pressure and the pressure distribution of underwater shock wave depend on the inner shape of water container which is one of the parts of high pressure generating device. In this study, we have investigated several water containers using numerical analysis and observation experiments. Therefore, underwater shock wave is affected by the reflected wave generated from the wall of water container and the magnitude of reflected wave depends on the inner angle θ of water container. The pressure and velocity of reflected wave is gradually increased with increasing inner angle θ of water container.