Abstract: using test apparatus underwater explosion, it is studied that the desensitization phenomenon of emulsion explosives which is sensitized by glass micro-balloons and expanded perlites in different dynamic pressures, and the desensitization degree of two kinds of sensitized methods are compared at the same dynamic pressure fore-and-aft. The results show that the type of sensitization agent has a very effect on the desensitization of emulsion explosives under dynamic pressure. The desensitization degree of emulsion explosives sensitized by expanded perlites is larger than the one sensitized by glass micro-balloons.