The test theory,design procedure and data analysis of Langlie method and up-and-down method were analyzed,and the experimental results of impact sensitivity of certain explosive HMX were compared. The results show that Langlie method is almost insensitive to the initial estimate,while up-and-down method is sensitive to that. In addition,according to the experimental data,the fire probability of samples was attained at the same stimulus with two different methods. The sensitivity distribution curves were obtained from fitting the experimental data. When the safety and reliability of explosive is calculated on the basis of counting process method,the estimate value of Langlie method is more optimistic than that of up-and-down method. When the 0.001 responses is evaluated,the stimulus relative error of Langlie method is about 16% higher than that of up-and-down method,when the 0.999 responses is evaluated,the stimulus relative error of Langlie method is about 21% lower than that of up-and-down method.