Blast-proof unit is designed to alleviate the shock wave transmitting to the other unit, in which the damage of accidental explosion is mainly caused by the transmission wave through the wall and diffraction wave over the upper edge. Investigation on the blast flow field in blast-proof units subjected to internal blast loading is studied by numerical simulation in the current paper. The influence of the height of the proof unit is analyzed and on the cap situation is studied. The result shows that it may not have a positive effect on reducing the diffraction wave by increasing the height of units, because it may enhance the reflection wave, which might have a greater effect than the diffraction wave. We can reduce the shock wave in the next unit by adding a cap, which is very effective. The study may contribute to further understanding on the experiment results and the design of blast-proof units.

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