The conclusions after studying the rules and the principles of the six-drugs mixing forming the prescription of Yukmijihwanghuan(六味地黃丸) are as follows: 1. Yukmijihwanghuan cares for the three viscera; the liver, the spleen and the kidney and the three entrails; the urinary bladder, the gall bladder, and the stomach and it strengthens them as well. The drug can be used mainly for the cure of the Three Yang Channels of Foot and the Three Yin Channels of Foot. 2. The three drugs of Yukmijihwanghuan; Rehmanniae Radix, Dioscoreae Rhizoma, Corni Fructus altogether has the tonifying effect and the other three; Alismatis Rhizoma, Moutan Cortex, Poria has the purging effect. The first three kinds of drugs tonifies and the last three kinds of drugs purges. While these two groups of drugs are pitted against each other, they also balance each other harmoniously increasing the curative effect(remedial[curative] value). 3. Yukmijihwanghuan cools off the lung which is under metal category, helps the spleen, an earth category to be strong. It also adds the Water Qi to the kidney so that it stabilizes the Fire Qi. 4. Yukmijihwanghuan helps the kidney strongly, helps the urine to be excreted well, cools down the Fire Qi and makes dry things wet. 5. Rehmanniae Radix, the principal drug of Yukmijihwanghuan and Corni Fructus, the minister drug of the medicine have a taste of thick and are materially heavy. The two drugs do the descending action that it tonifies Yin Qi and adds Essence of Life. The other ingredients of Yukmijihwanghuan; Moutan Cortex, Poria, Alismatis Rhizoma have effects on lowering the Fire Qi. If Fire Qi descends, then Water Qi ascends. Yukmijihwanghuan has an efficacy of lowering Fire Qi and increasing Water Qi.