As the raw materials for oral administration need to further complete the preparation process to improve the preparation effect and the effect of drugs, different requirements are placed on the physical properties of centrifugal spray dryer products. First of all, the moisture content is an indicator of dry products and generally requires control within a certain range, not too high or too low. Secondly, the drug collection is generally consistent with the amount of control load, which requires that the bulk density of the product is stable and the product has good fluidity. Oral stroke usually requires an immediate antidote. In general, changing the spread of atomization or changing the operating conditions to control the drying speed can produce products with different pile densities, but the range of change is limited.