Without any protection treatment,reinforced concrete shall be corroded in harsh environment,and the durability of concrete structure must decrease significantly thereby. The organosilicon impregnating agent is a common method for protecting the reinforced concrete against damage. It consists of alkyl alkoxy silane and / or siloxane. In the UV irradiation conditions,C- C and C- H bonds in the molecular structure will be destroyed due to low bond energy,and thus concrete loses hydrophobicity. In the study,thr...