A case of pancreatic pseudocysts and bloody pancreatic ascites as complications of chronic pancreatitis in eleven-year-old girl was reported. She was admitted to the pediatric ward with chief complaints of abdominal distension and bloody ascites. About nine months prior to admission, when she was stuck by a bicycle, she had sustained a blow on her abdomen. She has been apparently well until four months prior to admission, when she began to feel colidy and intermittent abdominal pain and her appetits became poor. About a week prior to admission, her mother noticed that the girl's abdomen was distended. One day prior to admission, bloody ascites was revealed by paracenteis at a local clinic. Clinical and laboratory pictures were observed for 3 months. Ascites amylase at preoperative state were 496~705 u/dl and 740~772 u/dl Protein in ascites was 2,390mg%~4,820mg%. On the fifty fifth hospital day, an exploratory laparotomy was performed. About 7,000cc of bloody ascites was drained. A 30 x 20cm sized pseudocyst with thin wall was found between stomach and transverse colon. The portion of disrupted pancreatic duct was drained with sump tube. Abdomen distension and pain was markedly relieved after operation. On the 60 th postoperative day, ultrasonography of abdomen revealed no cysts. So sump tube was removed. A brief review of the literature was done.