Since people become aware of the significance of building material radioactivity to the living and working environment as well as human health, the radioactivity pertaining to building materials has drawn a worldwide attention, in addition, been a “focus” of study. After two years of investigating research on the building materials supplied in Tianjin, a full knowledge of the following factors has been got relating to the main building and decoration materials in Tianjin: γ radiation dose rate, level of natural radionuclide specific activity, indoor γ radiation dose rate, radon concentration, annual effective equivalent dose incurred by indoor γ radiation. Besides, such aspects are analyzed as the main contribution to γ radiation and radon concentration, means of differentiating classification for building material radionuclide limitation. A measurement method is established which is suitable for large-scale routine investigation of radioactive substances in building materials.