We compared the efficacy of each modality of treatment group in reducing the frequency of coronary artery abnormalities and change of clinical courses in children with Kawasaki disease in the children of 81 cases who were admitted in pediatric department of Yeungnam University Hospital from September 1985 to August 1990. Group A (37 cases)-aspirin alone, Group B (44 cases)-intravenous gammaglobulin (400 mmg/kg/day) for 5 consecutive days, plus aspirin. We studied the frequency of echocardiographic abnormalities, the duration of fever, and changes in the total white blood cell counts, platelet counts, ESR and CRP value at 1, 2 and 3 weeks of the illness and compared the results between the two groups. The results were as follows. 1) There was no significant intergroup difference in age and sex ratio. 2)The duration of the febrile period after the initiation of the therapy was significant shorter in group B (2.5±1.2days) than in group A: (5.2±3.5 days) (p<0.01). 3) No significant difference was noticed in the WBC and platelet counts in two groups as measured at admission day, 1 and 2 weeks of the illness, however, at 3weeks of illness significant difference was noted. 4) The CRP values measured at 1,2 and 3 weeks after treatment were significantly lower in group B (2.42±1.8, 2.00±1.2, 1.16±1.0) than in group A (7.22±5.3, 5.25±3.9, 1.85±1.2) respectively (p<0.01). 5) In 2D-Echocardiogram, coronary artery dilatation was more frequent in Group A than in Group B at 6month of illness (p<0.01). In conclusion, intravenous gammaglobulin therapy was effective in the shortening of the duration of fever and in the anti-inflammatory action and somewhat effective in prevention of coronary artery aneurysm.