Abstract：Based on the study and analysis of Y-shaped atomizers and their atomization mechanism, a new-type of fan-shaped spray atomizer is developed and experimentally studied. The flowrate, atomizing angle and Sauter mean diameter (SMD) in the center of spray under different air and liquid pressures, and the SMD spatial distribution of certain working conditions in transverse and axial directions are investigated. By fitting liquid flowrates with equation of Y-shaped atomizer, the values of coefficients suitable for fan-shaped atomizers are obtained, m=0.39, b=0.98. The atomizing angle a is approximately between 90o and 98o and varies within narrow limit. The droplet size distribution of spray in transverse direction is in a "W" shape, and in axial direction the SMD decreases gradually and becomes steady eventually.