Penetration crystallisation waterproof coating (Crystal infiltration activity of parent material) is a molecular structure of active silicon active material, small molecular weight, containing both hydrophobic and hydrophilic groups, its hydrophilicity is greater than the hydrophobicity, can be dissolved in water, in a dry environment does not occur in the phenomenon of condensation and crystallisation, while in the humid environment occurring It is more hydrophilic than hydrophobic, soluble in water, and does not undergo condensation and crystallisation in dry environment, but under moist environment. It is made by mixing activated silica, cement, activated inorganic mixture and so on.