to study the response characteristics of explosives, the confined shells loaded with three kinds of explosives were irradiated by laser to obtain the temperature-time profile of the explosives with temperature test system. The explosives’ response characteristics and difference were analyzed under the laser irradiation, the results showed that the explosives had the higher temperature rise rate, the shorter delayed time and higher ignition temperature with the less diameter of laser irradiation in the same power; Compared with the melt-cast explosives, the THL needed more lag time and higher ignition temperature than TOL, and resembled TOL in the reactive phenomena; the PBXN-109 was more phlegmatized and had less difference in lag time than the twe types of melt-cast explosives, moreover had different demolition effects.