Churg-Strauss syndrome (CSS) is a systemic small-vessel vasculitis characterized by asthma and eosinophilia. We report a case of CSS complicated by multiple aneurysms in the small intestine. A 57-year-old man was admitted to our hospital with fever and blood eosinophilila. During admission, aneurysms in his small intestine ruptured and partial resection of the small intestine was required. After combination therapy of glucocorticoid (GC) and cyclophosphamide (CYC) for 6 months, aneurysms in the small intestine disappeared. The gastrointestinal involvements usually result in poor prognosis in CSS. However, combination therapy of GC and CYC might be effective for remission of aneurysms caused by small vessel vasculitis.