INTRODUCTION Diabetes Mellitus (DM) is a metabolic disease with high blood glucose level due to disruption of insulin secretion, insulin-act or both. As the increasing of DM Prevalence, the improving of DM medicine also increases. Herbal medicine for DM is explored from many species. Cinnamon burmanii was reported to contain flavonoid and cinameldehide which have been proven as in vitro antioxidant.