Based on analyzing related benefit entity involved in exterior wall external insulation for buildings, the paper establishes target matrix for related decision subject; by further analyzes their cost-value system; constructs life cycle cost model for exterior wall external insulation. 在对建筑外墙保温节能利益相关者分析的基础上,建立了有关决策主体的目标矩阵,并对其成本&效益进行深入分析,构建了外墙外保温生命期成本模型。