Abstract: In order to prevent and reduce the serious damages caused by mine gas explosions, the homemade combustible gas-dust explosion device of horizontal pipeline were used to simulate the mine tunnel. By changing the angle and location of curved pipe，the paper studied the variation law of the gas explosion pressure and flame spreading velocity. The results showed that curved pipe highly increased the gas flame transmission velocity, the max explosion pressure and had great influence on gas explosion. Curved pipes of different angle had different influence on gas explosion，among that curved pipe of 45-degree angle had least influence and curved pipe of 90-degree angle had maximum influence.