Abstract: In order to reduce the concentration of toxic gas in blasting smoke， an inhibitor of toxic gas in emulsion explosive blasting was developed based on the chemical reaction of explosive explosion. Two factors affecting the effect of inhibitor addition ratio and loading mode were selected for experimental study. Four addition ratios of 0mass%， 3mass%， 5mass% and 8mass% were set， and four loading modes of uniform mixing， radial coupling with suction pipe， radial coupling without suction pipe and axial coupling were set.The test results show that : ① After explosive explosion， there are four main components of toxic gases. Among them， CO accounted for the highest proportion， accounting for about 37.36% ~ 37.98% of the total toxic gas. The production of NH3， NO and NO2 were similar， accounting for 21.22%~23.29%， 20.58%~20.8% and 17.99%~19.24% of the total， respectively. ② With the increase of inhibitor addition ratio， the detoxification rate increased first and then decreased， and 5mass% was the best addition ratio. ③ The anti-virus effects of different loading methods were in the order of uniform mixing structure， non-pipe radial coupling structure， pipe radial coupling structure and axial coupling structure. Among them， the detoxification rates of uniform mixed structure were 26.07%，56.79% and 59.54% higher than those of other structures respectively.

Key words: afterfume, rock emulsion explosive, blasting toxic gas inhibitor, addition ratio, packing method