The histological structures of digestive tracts of White-breasted Waterhen (Amaurornis phoenicurus) have been studied by light microscopy. The plicae in the esophagus are developed and the wall of the esophagus is lined by stratified squamous epithelium. The lamina muscularis mucosa is a layer of longitudinal muscle of 0.06-0.26 mm thick, while the tunica muscularis is a layer of circular muscle of 0.19-0.27 mm thick. The number of the esophagus glands in the cervical segment is more than that in the thoracic segment. The wall of the glandular stomach is lined by simple columnar epithelium. There are two kinds of gastric glands in the tunica propria. The simple tubular glands are 0.11-0.20 mm long. And the compound tubular glands are 1.19-1.26 mm thick, accounting for 77.8%-80.4% of the wall of the glandular stomach. The koilin in the surface of the muscular stomach is developed and 0.16-0.24 mm thick. The simple tubular glands in the tunica propria and the koilin form the poicae. The muscular layer is composed of interior circular muscle and outer longitudinal muscle. The villi in the intestine are not branched and have no central lacteal. The villi in the duodenum and rectum are long and dense and those in the jejunum are fingerlike. There are some dense lymphoid nodules in the villi of the duodenum and rectum. The villi in the cecum are short and the glands are few.