Atomizing nozzle is the core component of FGD ( Flue Gas Desulfurization) devices.In order to improvethe desulfurization efficiency,efficient atomization nozzles should be developed.In this paper,by taking air as theatomization medium of limestone slurry and by using a laser particle size analyzer as well as a high-speed digitalcamera,the atomization and flux characteristics of a new-type two-fluid nozzle were experimentally investigated,and the coupling relationships between the flux parameters ( such as air pressure,liquid pressure and limestoneslurry mass concentration) and the atomization parameters ( such as nozzle spray angle,average particle size andparticle uniformity) are revealed.The results indicate that air pressure has greater effect on the atomization characteristicsthan the liquid pressure and the limestone slurry mass concentration,and that the nozzle flow rate,which isinsensitive to the limestone slurry mass concentration,increases with the increase of liquid pressure,but decreaseswith the increase of air pressure.