Abstract: Coal mine can be damaged by extremely strong gas explosion, and the importance of suppressing gas explosion in coal mine safety production is self-evident. The basic assumptions are used to analyze the shock wave propagation laws and the strength characteristics during gas explosion. The expressions among wave-front parameters are derived during strong and weak shock wave propagation process. Meanwhile, during the gas explosion, the weaken laws of cylinder shock wave and overpressure parameters with distance of propagating are deduced. Through comparison and analysis of theoretical calculations and numerical simulation data, the data are almost identical.