The main factors influencing the granulation of fertilizer disc granulator are mainly the diameter of the disc, the height of the side of the disc, the inclination of the disc, the rotating speed and the water addition. The ratio of side height and diameter of the disc granulator is generally 0.12 ~ 0.17. Its diameter can be calculated from the production intensity obtained from the test or actual production assessment. The inclination of the disc granulator is determined according to the natural angle of repose of the wet powder before granulation, for example: The natural angle of repose of potassium chloride is 36°; dipotassium phosphate is 31°; coarse whiting is 31° ~ 35°. When the inclination is less than the natural angle of repose of the wet powder, the material will stick to the disc; however, as the inclination increases, the rotation speed increases, the material residence time becomes shorter, and the overflow particle size becomes smaller, so it should be determined according to specific conditions, generally 40°～60°. Increasing the disc rotation speed can increase the granulation rate of fertilizers. As the amount of water added increases, the granulation rate of fertilizer first increases and then decreases. The smaller the particle size of raw materials, the higher the granulation rate.