Friedman′s formula for calculating the characteristic drop height of impact sensitivity (H₅₀) of energetic materials(EMs) was derived. A numerical method of estimating the value of H₅₀ was presented. The corresponding computer program was written. The experimental 50% drop height of eight EMs: HMX，RDX，TNT，PETN，BTF，BTF，Tetryl，NG were certificated with the programmed program，considering that the programmed program is suitable for fast computation of H₅₀ and predicted 50% drop heights for PBX-JH-94 and PBX-JO-96 are believable to a certain extent.