Architectural paint is used commonly to improve appearance and protection of materials. Desirable requirements for paint as a architectural material are high water vapor permeability, water resistance and staining resistance. In this study, we investigated the effect of monomer composition of latex on water vapor permeability, water absorption and staining resistance. The results showed that water vapor permeability and staining resistance of latex containing acrylonitrile(AN) were better than those containing methyl methacrylate(MMA), styrene monomer(SM).