PURPOSE: A composition containing Rhynchosia volubilis Lour. powder or extract thereof is provided to suppress and control sharp increase of blood glucose and to prevent and treat diabetes.CONSTITUTION: A pharmaceutical composition for preventing and treating diabetes or diabetes complication contains Rhynchosia volubilis Lour. Powder or extract thereof as an active ingredient. The extract is prepared using water, organic solvent, or a mixture solvent thereof. The diabetic complication includes arteriosclerosis, cerebral infarction, cerebral thrombosis, myocardial infarction, hypertension, hyperlipidemia, or adiposity. A health functional food for preventing and treating diabetes or diabetic complication contains the powder or extract thereof as an active ingredient.COPYRIGHT KIPO 2013본 발명은 혈당강하 효과를 갖는 여우콩(Rhynchosiavolubilis Lour.) 분말 또는 이의 추출물을 포함하는 당뇨병 예방 및 치료를 위한 조성물에 관한 것으로서, 본 발명의 여우콩 분말 또는 이의 추출물은 혈중 포도당 농도의 급격한 상승을 억제 및 조절함으로서 당뇨병 예방 및 치료를 위한 약학조성물 및 건강기능식품에 유용하게 이용될 수 있다.