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Background and Objective: Kawasaki disease is the common acquired heart disease in children. Kawasaki disease is a vasculitis that predominantly affects the medium-sized arteries, with a striking predilection for the coronary arteries. This study was done to determine the relationship between coronary aneurysm formation and neutrophylia, in childern with Kawasaki disease. Method: This descriptive – analytic study was done on 80 children (45 Males, 35 Females) with typic and atypical Kawasaki disease in Afzalipoor hospital, Kerman, Iran during 2011-13. According to transthoracic echocardiography, patients were divided into childern with and without coronary aneurysm. CBC count, ESR and Peripheral blood smear was performed for each subject. Results: White blood cells, neutrophils, platlets and ESR in childern with coronary aneurysm, was non- significantly more than without aneurysm. Duration of fever in chidern without aneurysm was non-significantly more than childern with coronary aneurysm. Conclusion: Neutrophils counting by itself is not sufficient critria for the prediction of the aneurysm risk in kawazaki disease.