Objective To study CT features and clinical values of children with abdominal cystic masses. Methods The clinical data of 81 cases of children with abdominal cystic masses in our hospital were retrospectively analyzed. The CT features of masses were analyzed and compared with surgical or pathological findings. Results Among the 81 cases of children with abdominal cystic masses, there were 24 cases (29.63%) of true cysts, 12 cases (14.81%) of pseudocysts, 19 cases (23.46%) of cystic deformity with clear cystic masses, 21 cases (25.93%) of cystoma with cystic masses, microcavity tumor or large capsule tumor and partial calcification and enhancement, and 5 cases (6.17%) of cavity effusion or empyema. And unilateral hydronephrosis was seen central low density and peripheral half-moon shape, and enhancement was visible in the peripheral renal parenchyma by enhanced scan in the 5 cases. And the appendiceal abscess was seen accumulation of liquid around the cecum and thick and irregular wall. 77 cases were correctly diagnosed by CT with the coincidence rate of 95.06%. Conclusion CT can be a comprehensive and intuitive display of abdominal cystic mass characteristics of children, and can provide an important basis for the clinical treatment of diseased masses.