Li Minshan, deputy chief physician of anorectal department of Beijing Chaoyang Hospital of Integrated Traditional Chinese and Western Medicine, member of anorectal branch of Chinese Medical Association, surgical branch of Chinese Medical Association and Chinese Medical Association, has been engaged in theoretical research and clinical research of difficult diseases in anorectal surgery for more than 30 years, and has accumulated rich clinical treatment experience in large intestine and anus. He is the leader of anorectal discipline in the hospital, and studied in the General Hospital of Chinese People's Liberation Army (30 1 Hospital).