Objective : Our objective is to evaluate clinical aspects of hydrops fetalis, which is classified as immune and nonimmune. Materials and Methods : From Oct. 1988 to Nov. 1997, 44 pregnant women were evaluated with various tests, including cordocentesis, fetal echocardiography, and detailed ultrasonography for the indication of ultrasonographically detected fetal hydrops or suspected fetal hydrops. Maternal mean age(±standard deviation) was 29.3(±2.8) years and gestational age was within the range of 16 weeks and 37 weeks. Results : Of 44 cases, 4 cases (9.1%) were immune hydrops, 40 cases (90.9%) were nonimmune hydrops. Fetal transfusion was done to 4 immune hydrops. Of 4 transfused fetus, 2 fetuses died within 12 hours of transfusion, and survival rate after intrauterine transfusion was 50% (2/4). Seven cases had chromosomal abnormalities(18.9%, 7/37), ten cases (25%) had cystic hydroma, seven cases (17.5%) had cardiac anomaly, three cases (7.5%) had fetal infection. Excluding 2 cases of follow-up loss, eight cases of stillbirth and four cases of pregnancy termination, five cases survive beyond neonatal period. Conclusion : Our experiences show that fetal transfusion for immune hydrops can be tried in the cases remote from term and prognosis of nonimmune hydrops is dismal in spite of aggressive work-up for identifying causes.