Abstract： This article mainly introduces the clinical experience of Professor DANG Zhongqin in treating chronic constipation in long- term clinical practice. The authors have learned from the Professor in the outpatient department， collected the relevant case data，and observed the clinical effect to find that Chinese medicine has obvious advantages in the treatment of chronic constipation，which can not only improve the clinical symptoms and the quality of life of patients，but also prevent the further development of the disease. Under the guidance of the disease- syndrome- symptom theory， Professor Dang develop special prescriptions for specific diseases. In clinical practice，Tongyou prescription is mainly given， the combination of syndrome differentiation and disease differentiation is adopted， and the drugs are flexibly modified according to the symptoms，which provide new ideas and methods for the treatment of chronic constipation with Chinese medicine.