PURPOSE: A composition containing Ulmi pasta semen extract and pharmacologically acceptable carriers is provided to induce leukemica cell apoptosis and to be applied to pharmaceutical formulations.CONSTITUTION: A composition for preventing or treating leukemia contains an active ingredient prepared by dipping pulverized Ulmi pasta semen in an aliphatic solvent. The extract is prepared by extracting at 50 Deg. C for 24 hours. The EC50 value obtained by alamar blue analysis is 61-65ug/ml. The aliphatic polar solvent is 1-4 alcohol. A method for preparing the extract comprises: a step of pulverizing dried Ulmi pasta semen a step of dipping the pulverized Ulmi pasta semen in an alcohol solvent of 1-4 carbon atoms at 60°C to obtain active ingredients a step of drying the alcohol solvent containing the active ingredient to obtain solid active ingredient and a step of freezing the solid active ingredient.COPYRIGHT KIPO 2012본 발명은 건조된 무이(蕪荑) 분쇄물로부터 지방족 극성 용매를 이용하여 추출되고 유효성분인 무이 추출물 및 약리학적으로 허용 가능한 담체들을 포함하는 백혈병 치료용 조성물을 제공한다. 상기 무이 추출물은 미량만으로도 백혈병 세포의 사멸 및 증식 억제를 유도할 수 있어 다양한 약학적 제형에 폭 넓게 적용될 수 있다.