As global warming progresses, nation around the world are trying to reduce emission of $CO_2$ that accounts for the greatest portion of greenhouse gases. To reduce $CO_2$ emission, it is first necessary to estimate $CO_2$ emission of each industry. Construction industry is a national infrastructure industry that takes up 17% of GDP in korea, in addition, the concrete is most commonly used in construction industry. The purpose of this study is to estimate the $CO_2$ emission about whole process of concrete. This study was constructed the method to evaluated $CO_2$ emission generated in the stage of material production, material transportation, manufacture, remicon transportation, and pouring concrete.