Abstract: In order to solve the faults in usual measurements of the characteristic of droplet distribution, a new measurement method combining high speed imager with digital image processing for the droplet size distribution analysis in spray field was presented. Meanwhile it can reconstruct the photo of droplet distribution based on the droplets' characteristic. The new measurement method can avoid the interference in spray field, at the same time, it can detect the droplet parameters quickly and accurately, and provide the basic way for the research on droplet motion in spray field.