Abstract: Experimental research has been done on a twin-fluid nozzle using FAM laser particle distribution analyzer. Factors affecting spray angle and distributions of Sauter mean diameter (SMD) have been analyzed. It is found that the most important parameters are air liquid ratio and slurry concentration. The SMD will be decreased when decreasing slurry concentration and increasing air liquid ratio. Fine atomization can be obtained for air to liquid ratio in the range from 0.09 to 0.3. The SMD changes from 20 micron to 100 micron respectively. The correlation of SMD has been obtained considering slurry concentration and air liquid ratio. It is found that the spray angles are similar for three nozzles. They are about 20 to 25 degree. The spray angle will be decreased when increasing air to liquid ratio but almost unchanged when changing slurry concentration.