In order to reduce the laser initiation energy and understand effect of laser wavelength on initiation sensitivity of explosives , the weak chemical bond and sensitive laser wavelength of PETN , RDX, HMX and HNS explosives were analyzed through spectrum , thermal decomposition mechanism and quantum mechanics calculation .Results show that the weakest chemical bond of PETN , RDX, HMX and HNS are nitryl whose correspondent resonant coupling laser wavelength is around 6300nm,and the laser wavelength inducing electronic transition of PETN , RDX, HMX and HNS explosives is among 190nm~250nm.Under the action of laser at these characteristic wavelengths , laser initiation energy of explosives can be decreased .%为了了解激光波长对炸药起爆感度影响，降低炸药激光起爆能量，通过炸药光谱、分解机理和量子化学计算，分析了常用PETN，RDX，HMX和HNS炸药的化学弱键和激光敏感波长。结果表明，PETN，RDX，HMX和HNS中最弱化学键均是硝基键-NO2，其对应的共振耦合作用激光波长均在6300nm左右；引起4种炸药电子跃迁激发的激光波长在190nm～250nm之间。在这些特征波长激光作用下，能够降低炸药的起爆能量。
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