In order to improve the performance of emulsion explosive, a chemical foam-ing technique was used to sensitize the emulsion explosive in Huangshaping lead-zincmine,that is to say, under the precondition of explosive production which was ensured tobe safe,the quartz micropowder as an additive of emulsion explosive was used to sensitizeit,so as to improve the explosion sensitivity and reduce the temperature-keeping foamingtime,Some concrete operation in the process of sensitization, the theoretical basis for addi-tion of additive and the results of explosive production test after sensitizing are discussedin this paper. This provides the practical experience for the improvement on the productionand application of emulsion explosive in the mines.