Abstract: A novel photoreduction reaction of 4,4’-dimethylbenzophenone in the solid-state was investigated. The crystal lattice arrangement of 4,4’-dimethylbenzophenone was adequate for the requirement of the abstraction of hydrogen atoms from adjacent molecules. Photochemistry of 4,4* dimethylbenzophenone in the solid-state was distinct from that in solution, and 4-(P-methylben-zoyl)benzyl-bis-(P-methyl)phenyl-methanol has been obtained. The mechanism of the solid-state photochemical reaction of 4,4’-dimethylbenzophenone was discussed simultaneously.