The present study aims to describe the morphological characteristics of the digestive tract in Plagiognathops microlepis by vivisection, paraffin section and light microscopy. The results showed that the digestive tract of these fish consisted of oral-pharyngeal cavity, esophagus and intestine. The arrangement of their pharyngeal tooth in the oral-pharyngeal cavity was 3.7.3/3.7.3. The tougue was small and triangular, its mucosa surface with taste buds was covered with stratified aquamous epithelium. The esophagus and intestine consisted of mucous, submucosa, muscularis and adventitia. Well-developed plica was present in the esphagus, of which the mucous epithelium was stratified squamous epithelium, including abundant goblet cells and a few taste buds. The intestine was long in length and curve-sharped. The index of the the intestine length was 4.49±0.58. Intestinal villi on the foregut were much more developed than that of the midgut and hindgut. The mucosa layerappeared simple columnar epithelium and the free surface is full of microvilli. The goblet cells of the mucous were much more abundant in the foregut and midgut than in the hindgut. The results indicated

that the digestive tract morphology of Plagiognathops microlep is adapted to its omnivorous nature.