Abstract: The atomization features of a plain injector in high speed transverse air stream were investigated By Malvern. In this investigation, air velocity ranged from 50-150m/s, pressure drop of fuel injector, (1.1-4.2) × 106Pa, diameter of orifice, 0.5-0.9mm, axial distance between the injector apd the survey plane, 50-250mm. Aviation kerosen was used ip all experiments. It was found that the atomization features in high pressure drop of fuel injector were greatly differed from the low pressuie drop of fuel injector.