Dioscorea nipponica Makino is a plant of the family Dioscorea, which is distributed in Inner Mongolia, Heilongjiang, Jilin, Liaoning and other provinces in China. The plant is not only a main resource to medicines for cardiovascular diseases, for example DP and DioscorninTablets, but also one of the useful sources of diosgenin, a widely used raw material for the production of steroid and contraceptive. It has been used for the treatment of many ailments including coronary heart diseases, atherosc...