Non parasitic liver cyst is a rare disease, and cases have been reported since first discription of Bristowe in 1856. However there are difficulties in classification, diagnosis and treatment about this disease. The diagnostic methods have been developed, and the diagnostic accuracy is high now, but the nature of the cyst can be identified only at the time of operation or by aspiration of the cyst, and the treatment methods are decided according to the content of the cyst. We have experienced 33 cases of non parasitic cystic disease of the liver at the Sevrance hospital from Jan. 1964 to Apr. 1984, and analysed them The following results were obtained; 1) Male and female ratio was 1:2.7, and 82% of the patients were over the age of 35. 2) The abdominal symptoms were noted in 22 cases (67%), and the symptoms were Rt upper abdominal pain, Rt. Upper abdominal discomfort, upper abdominal mass and indigestion etc. 3) The liver function tests were normal in most patient.4) The solitary liver cyst only were 9 cases, solitary liver cyst with renal cyst were 10 cases, polycystic liver only were 10 cases, and combined polycystic liver and polycystic kidney were 4 Cases. ) The ultrasonography was important and accurate diagnostic tool above the other.6) 8 cases were operated; 4 excisions, 2 lobectomy, 1 unroofing, and 1 Roux en Y cystojejunostomy. 7) The postoperative complication and motality were not occurred.