Abstract: Droplets size, its spatial distribution, mean diameter and other atomizing performances in the initial atomizing region of atomizing channel are obtained by hblography. Larger droplets come from unstable atomizing of fuel film widening on surface of the channel. Initial fuel volume distribution of the channel takes shape of saddle in initial atomizing region. Air velocity, surface tension, channel width and injector diameter are main factors affecting the atomizing performance of the channel. The relationship between meandiameter SMD and these factors is SMD