The synthesis of UDCA in this project uses the "biological enzyme" method. Compared with the currently commonly used "chemical synthesis" method, the biggest advantage is that it fully realizes "green synthesis": the entire production process adopts normal temperature and normal pressure conditions; avoiding the use of strong acids and alkalis. Use; Unlike chemical synthesis, which uses a large amount of organic reagents and produces a large amount of waste water and waste gas; the production environment has a high safety factor, and the overall process is green and pollution-free.