Atomization performance of free impinging jets with unequal nozzle diameter of 60% Glycerol-water （60G） solution was investigated using PIV technique. The liquid sheet breakup characteristics and droplet behaviors were studied under different Weber numbers （51≤We≤1605）， jet velocities （2.12 m·s^-1≤u≤6.37 m·s^-1） and nozzle diameters （nozzle 1： left nozzle diameter （D₁）=1.5 mm， right nozzle diameter （D₂）=2 mm； nozzle 2： D₁=2 mm， D₂=3 mm）. The droplet distribution of the composite energetic material binder solvent diethylene glycol-water solution was also investigated. The results show that， as We number increases， liquid sheet breakup length increases first and then decreases from edge-free mode （M3） beginning， the liquid sheet thickness and droplet diameter decrease while the droplet velocity increases. Nevertheless， as the nozzle diameter increases， changes in liquid sheet breakup mode are insignificant， and the liquid sheet breakup length， thickness and droplet diameter all increase， while the droplet velocity decreases. At the same time， the empirical correlation equations are obtained between liquid sheet breakup length， liquid sheet thickness， Sauter mean diameter D［3，2］ and nozzle diameter， We number. After validation using the diethylene glycol-water solution， it reveales that with the increase of jet velocity， the droplet diameter decreases and the distribution becomes narrow after the impinging of diethylene glycol-water solution. The error range of D［3，2］ values is within ±15% of the empirical correlation equation， which is consistent with the theoretical prediction results.