In korea, quantity of copper slag as a product in a copper smelting processs reaches 700,000 tons annually while its application is less. Chemical composition of Cu-slag is Cu 0.3～3.0%, Pb 0. 2～4.8%, Zn 0～11.0%, Fe 32.1～44.0%, S 0.2～2.0%, CaO or MgO 0～7.4%, SiO2 22.8～37.5%, Al2O3 0～8.0%, Fe3O4 3.0～6.0%. Copper slags are to use and its development, The quality of the copper slag which is caused by in physical properties research of slag, will come to reveal, special engineering development and usage with the function characteristic product, and it will be able to forecast. In fundamental test radiation properties of far-infrared ray, antibacterial test, antifungal test, it enforced the physical properties analysis of copper slag and the function characteristic research of test slag the conclusion of this study. Result of measurement of radiation properties of far-infrared ray of copper slags, the copper slag showed radiation ratio 0.90, radiation energy 3.62×102(W/㎡․㎛․40℃), and the continuous copper smelting slag showed radiation ratio 0.89, radiation energy 3.58×102(W/㎡․㎛․40℃). It is judged that it has the quality of the far-infrared radiation, the copper slag mortar showed radiation ratio 0.916, radiation energy 3.69×102(W/㎡․㎛․40℃) it confirmed that it will be able to use with far-infrared ray radiation materials.