Facing the increasingly serious energy and climate crisis, the concept of low-carbon indicates development direction for building conservation. However, building functions are easily neglected in the process of low carbon residential buildings construction. Therefore, based on the concept of value engineering, this paper presents a comprehensive evaluation method to evaluate carbon emissions of residential building. It highlights residential building functions as well. Function coefficient can be confirmed by establishing residential buildings function evaluation index system. Moreover,the unit carbon emission isadopted as cost coefficient. The low-carbon nature of residential building will be evaluated by the ratio of function coefficient and cost coefficient.The aim of this research is to advance the awareness of residential building carbon emissions, exploring the path of realizing maximum satisfaction of building functions with minimum carbon emissions, which can provide new ideas of residential building carbon emissions evaluation.