Anterior resection syndrome of rectal cancer is a common symptom in patients with rectal cancer after operation.It is mainly characterized by frequent bowel movements，increased defecation frequency，urgency，difficulty in excretion，anal downbearing distention，and fecal incontinence，etc.Although the symptoms will be slightly relieved over time，there are still some patients whose symptoms have not improved significantly for several years，and this abnormal stool condition is common in patients with colon cancer.Simple western medicine，acupuncture，moxibustion，acupoint sticking，enema and other treatments can alleviate some symptoms，but cannot cure the root causes and maintain the long-term effect.According to many years of clinical experience by Prof.Zhang Qing and the theory of “the lung and the large intestine are interior-exteriorly related”，he summed up Yiyi Baijiang Sanren Decociton.By regulating qi，dampness and blood to descend qi，eliminate dampness and resolve stasis，along with modification based on syndrome differentiation，and treating both symptoms and root cases，the curative effect is remarkable for patients with anterior resection syndrome after rectal cancer surgery.