To study the influence extent and law of near-ambient temperature changes on shock initiation characteristics of explosives, an experimental device with local heating and cooling to explosive was designed and established. Combined with Lagrangian analysis method, the growth process of shock initiation pressure at the near room temperature from 5 ℃ to 75 ℃ for two explosives (PBX-1: a HMX/TATB composite explosive; PBX-2: a TATB based IHE) was studied. Based on the experimental results, numerical simulation of the shock initiation process for two kinds of explosives was performed by the model of ignition growth. The results show that as temperature changing from 5 ℃ to 75 ℃, the growth of shock-initiation pressure of two kinds of explosives is gradually changing fast, the run distance to detonation becomes shorter and the reaction rate parameter G₁ in the ignition growth model becomes larger, indicating that the two explosives become more sensitive to shock as near-ambient temperature increasing, the effects of near-ambient temperature changes on safety of explosives can not be ignored.