Eucommia ulmoides is a traditional Chinese medicine that exhibits an antioxidative action and it’s leaves is commonly used as a medicine to treat hypertension[1~4]. This study was designed to investigate the regulative effects and possible mechanism of Eucommia ulmoides oliver leaves extraction on acute injury induced by carbon ion beams in mice. Eucommia ulmoides is a traditional Chinese medicine that exhibits an antioxidative action and it’s leaves is commonly used as a medicine to treat hypertension[1~4]. This study was designed to investigate the regulative effects and possible mechanism of Eucommia ulmoides oliver leaves extraction on acute Injury induced by carbon ion beams in mice.