Maifan Stone is one kind of non-toxic officinal rock which does no harm to living things, the mother rock of Maifan Stone is usually middle, acidic magma rock, which chemical composition contains some rare elements, rare-earth elements and radioelements besides the common elements such as Ca, Mg, Si, Al, Fe, K and Na. Maifan stone is sorptive, resolvable, PH accommodative, biologically active and mineral. It has the ability to absorb the dissociating metal ion in water. Al203, which accounts for 15% in Maifan Stone, is a kind of representative amphiprotic oxide, which can bidirectionally accommodate the numerical value of PH.