The anatomy and histology of liver,gallbladder and pancreas in Pachyhynobius shangchengensis were studied by routine H.E staining and mast cells (MCs) in the above organs were observed by modified toluidine staining.The results indicated that hepatic lobules were not evident,and the liver bundles interconnected into reticular structure.The nucleoli of hepatic cells were large.Most hepatic cells were mononuclear,but small proportion of hepatic cells were binuclear and tri-nuclear.The cell body in the hepatic side was bulky,and some up to 70 μm,but the ratio of the nucleus-cytoplasm was small.There were lots of chromatophore cells in the liver.The epithelium cells of gall bladder were simple squamous or cuboidal epithelium,but plica could not be observed.The connective tissue in the pancreas was underdeveloped.The border of the pancreatic cells was not circumscribed and their nuclei were larger.There were more MCs distributed in portal area,in hepatic portal vein and around pancreatic duct,but less MCs in other areas of liver and pancreas.However,there were more MCs distributed in the gallbladder wall.