Nan Jing (Chinese medicine) was originally called "The Yellow Emperor Eighty-one Nan Jing", the book is rumoured to be authored by Bian que in the eastern Han dynasty. This book has been compiled in the form of question and answer explanations. A total of 81 questions have been discussed. Therefore, it is also called "Eighty-One Nan". The book is based on basic theory and has also analyzed some disease certificates. Questions one to twenty-two is about pulse study, questions twenty-three to twenty-nine is about meridian study, questions thirty to forty-seven is related to urgent illnesses, questions forty-eight to sixty-one is related to serious diseases, questions sixty-two to sixty-eight is related to acupuncture points, and questions sixty-nine to eighty-one is related to the needle point methods.