Capsules are widely used in drugs, health products and functional foods, and have been used for more than 160 years. Capsule has become one of the main dosage forms of oral solid preparations other than tablets. At present, gelatin is the main material of capsule products in the market. The unique structural characteristics of gelatin molecules make it have some shortcomings and shortcomings in application. Therefore, the capsule dosage of plant-based components is increasing year by year, and the capsule shell made of HPMC is the most widely used.