Functional constipation (FC) is a common chronic digestive disease， and its incidence rate has been rising in recent years， which seriously affects peoples life quality. Professor Yao Shukun has engaged in medicine professtion for more than thirty years， and he has remarkable outcomes in treating diseases of digestive system. He has considerable experience for the treatment of functional constipation. Professor Yao thinks that integrated traditional Chinese and western medicine shall be applied on diagnosis and treatment of functional constipation. It should be clearly diagnosed， and then treated by syndrome differentiation， and the main characteristics of pathogenesis is damp and heat block gastrointestinal. The treatment of the disease should be clearing dampness and heat， smoothing and regulating qi.