Stearic acid polyhydroxy-40 ester is mainly used as a suppository matrix, such as dipyridine, progesterone, chlorhexidine, indomethacin, etc. It is used as a matrix and emulsifier for ointments to increase the decomposition and bioavailability of the drug, making the appearance of the ointment more delicate, white and evenly emulsified. Polyhydroxy 40 stearate can also be used as a pill matrix, and the dispersion disintegration of the drug in its dispersion system and the dissolution effect on the drug in dissolution are superior.