If we talk about the origin of gas, there are two versions. The origin of gas written by Taoist Zhang Zhishun over 80 years is a simplified version of Taoist scriptures. Zhang Daochang spent a lifetime studying medicine and read a lot of medical books. After a lifetime of compilation, he wrote the book Mi Jingzi's Recipe for Saving the World. Moreover, Zhang Daozhang highly praised Wang Qingren’s medical correction method in the Qing Dynasty.