Hua tuo is good at medical research. "Once"? 6? 1 Hua Tuo's Biography says that he is "proficient in the number of classics and knows the art of mending heaven", especially "proficient in prescriptions and medicines". People call him a "magic doctor". He once compiled his rich medical experience into a medical book called Qingnangjing, but it failed to be handed down. But it can't be said that his medical experience is completely lost. Because many of his successful students, such as Fan A, who is famous for acupuncture, wrote Materia Medica and Li Dangzhi, who wrote Materia Medica, all partially inherited his experience. As for Hua Tuo's Han Zang Jing, it was written by Song people and published in his name. But it may also include some still popular contents in Hua Tuo's works.