In the solar energy abundant area with heating requirement, due to strong solar radiation, the exterior walls with different orientations of the residential building have great difference in the received solar radiation, especially for the south-north exterior walls. To more effectively utilize the solar energy and reduce the heat preservation cost,this difference shall be manifested in the building envelope insulation performance design. In this paper,the solar radiation obtained by exterior walls with different orientations in the residential building during the heating period was achieved through the analysis of standard annual meteorological database in Lhasa. Furthermore, basing on the analysis of effective heat transfer coefficient, the net heat loss ratio of exterior walls with different orientations and the limited values of heat transfer coefficient were obtained. With the comparative analysis of the new limited values and the active one, it was known that the unbalanced insulation was significant for the practical engineering.%在有供暖需求的太阳能资源富集地区,由于太阳辐射强烈,居住建筑各朝向外墙,尤其是南北向外墙接收的太阳辐射量差异巨大,为了更有效地利用太阳能及降低保温成本,这种差异应表现在建筑围护结构保温设计中.本文通过对拉萨市标准年气象数据库的分析,得到了其居住建筑各朝向外墙供暖期内获得的太阳辐射量；通过对各朝向外墙有效传热系数的分析,得到了各朝向外墙净热损失比例以及基于现行传热系数限值的非平衡保温传热系数限值.新旧传热系数限值的对比证明了非平衡保温具有现实工程意义.
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