Development model of emulsified oil jet and micro-explosion properties of water drops are analyzed，cavitation effect can change the jet atomizing angle，therefore，an important guideline to describe oil jet atomization is atomizing angle. Absolute diesel fuel and different moisture content emulsified diesel fuels are researched by high-speed camera system from the experiment for studying the atomizing properties of water drops when high-voltage impulse injects the gas medium. The theory and experimental results show that lots of water drops of emulsified oil reduce jet dynamic strength when the jet unloads，so it has stronger dispersed properties. Emulsified diesel fuel can spray more capacity than absolute diesel fuel，the width of jet is greater and the spraying atomizing angle increases. When the moisture percent of emulsified oil is 10%，the atomizing angle can get to the maximum.