According to the theory of traditional Chinese medicine,the tongue is thought to be an outer manifestation of the status of the viscera.It can be divided to spleen-stomach area,liver-gall area,kidney area,and heart-lung area.The tongue coating is formed by stomach-Qi.the tongue,especially spleen-stomach area,and the tongue coating may reflect the status of the spleen and stomach.This article summarizes the research overview of TCM tongue diagnosis in spleen and stomach disease.