Abstract: To find out the relationship between the sensitizer and the emulsion explosive pressure desensitization,the pressure desensitization of the emulsion explosives was studied which were sensitized respectively with two types of compound sensitizers of chemical foaming agent + hollow glass microballoon particles and hollow glass microballoon particles + expanded perlite. The pressure desensitization degrees were calculated with the explosion wave crest value of the emulsion explosive which was tested under water after it was pressed by the host charge' explosion wave,and the pressure desensitization degrees of the emulsion explosives with the compound sensitizers were compared with that of the emulsion explosives with a single sensitizer. The results indicates that the pressure desensitization degrees of the emulsion explosives sensitized with the first compound method are between that of the emulsion explosives sensitized by single chemical foaming agent and that of the emulsion explosives sensitized with single hollow glass microgalloon,for example,the desensitization degrees at the 10 cm pressed spacing are 1.000,0.983,0.210 respectively,and that the pressure desensitization degrees of the emulsion explosives sensitized with the second compound method are less than that of the emulsion explosive sensitized respectively by the single sensitizer of hollow glass microgalloon and expanded perlite,their desensitization degrees at the 10 cm pressed spacing are 0,0.274,0.618 respectively. Results show that the pressure desensitization of the emulsion explosives was caused mainly by the combining effect of the anti-pressure performance of the sensitizer particles or bubbles and the partial emulsion breakage around the micro-interfaces between the particles and emulsion matrix.