Using electrical conductivity apparatus,electrical conductivity of emulsion explosive sensitized by two kinds of sensitizing agents was measured under dynamic pressure. Demulsification degree of emulsion explosive was denoted by electrical conductivity. Effects of the type and content of sensitizing agent on demulsification degree were analyzed. Experimental results show that the electrical conductivity of emulsion explosive increases with sensitizing agent content under the same dynamic pressure, on the other hand, with the same content of sensitizing agent, the electrical conductivity of emulsion explosive sensitized by glass micro-balloon (GMB) is less than that of sensitized by expanded perlite. So the dynamic pressure resistance ability of emulsion explosive sensitized by GMB is better than that of sensitized by expanded perlite. Reducing sensitizing agent content properly can reduce demulsification of emulsion explosive and improve its dynamic pressure resistance ability.