Thirteen cases of pancreatic cyst were analysed,including 6 cases of retention cyst,4 cases of cystadenoma and 3 cases of cystadenocarcinoma.The disease has no speciality in clinical symptoms ultrasonography and CT have high validity in locating the cyst,but no value in determing its pathological nature.Multiple compartment of the cyst were often seen.Serous fluid and flat epithelial cell existed mainly in retention cyst.Mucinous fluid and cubic/column epithelial cells were always seen in cystadenoma and cystadenocarcinoma.Cystectomy is an appropriate operation for the disease.