According to the characteristics of serpentine in such aspects as its chemical composition, crystal structure and chemical bond, the authors have divided the activated atom group in serpentine into five classes, i.e. unsaturated Si—O—Si,O—Si—O,OH—Mg—OH(O),OH-,and O—H—O. With these unsaturated chemical bonds, serpentine is of high chemical activity and biological activity. Chrysotile can easily enter the cell of organism because of its nature of one-dimensional nanometer_sized silk. When chrysotiles act with body fluid, they release OH-,Mg2+,SiO2,Ni2+, O and some other components, forming an alkaline_oxidizing environment in the body, which seriously interferes with the role of cells, and results in various diseases of the organism.