Through the histogram method and Kolmogorov test, it was obtained that the sensitivity coefficient of variation for D6-2 artillery primer and mechanical explosive devices approximated the normal distribution of (0.34,0.1²),(0.3, 0.1²), respectively． Using the upper limit of coefficient of variation for mechanical explosive devices, the reliability design for initiating explosive device was developed. Results indicate that the coefficient of variation determined is practical for the reliability design.