Functional constipation and functional defecation disorders are common types of functional gastrointestinal disorders.However, it still deserves further discussion on the definition of functional constipation and the classification of both functional constipation and functional defecation disorders, in spite of the existence of Rome Ⅲ and domestic "guidelines of diagnosis and treatment of chronic constipation (2013, Wuhan). " The main physiological disorder of functional constipation is the prolongation of the conlonic transit time (CTT), while functional defecation disorders, so called functional outlet obstruction, lies in the abnormality of rectoanal reflex.So it is suggested to classify both the functional constipation and functional outlet obstruction into the term of functional evacuation disorder(FED). Those two kinds of disorder can exist independently and concurrently.FED often accompanies by emotional disorders.It necessitates the combination therapy of emotional and somatic symptoms when treating the FED accompanied with emotional disorders.