The pancreatic calculus fragments are usually composed of granules cemen- ted by the light yellow yellowish brown cementing material. There are many cavities, having different snaps, among the granules. The pancreatic calculus consists of the following two kinds of materials; (1)Calcium carbonate, occurring as crystalline calcite, of which the most granules and their cementing material of the pancreatic calculus are made. Accoramg to optical mennncation,X-diffraction, mirarea spectyoscopy and differential thermal analysis, physical and optical parameters of the pancreatic calculus approximate fo Those of natural calcite.(2)Phosphate, Occurs as crystalline substance, being microgranular or fibrous, It is usually distributed around the carbonate aggregates on the cavity walls and insert occasionally among the carbonate crystals as stringer veins. This phosphate resembles a synthetic compound, iron phosphate (FePO4)，in chemical composition, and X- ray diffraction characters. In view of the compositions and the texture of the pancreatic calculus in this pancreatolithiasis case the denatured and necrotic parts of the pancreatic entity are first precipited with calcium carbonate and later a little phosphate. These are the remaining traces of the pancreatic necrosis which is the result of chronic pancreatitis.