中文摘要：

通过综合考虑西安市既有住宅现状以及节能改造的使用寿命，确定了西安市合理的节能改造范围，并且对节能改造项目优选的必要性进行了论述．基于既有住宅的性能运用层次分析法建立了既有住宅节能改造评价指标体系，并运用模糊综合评判法建立了既有住宅节能改造项目的判定模型，为西安市既有住宅节能改造的项目优选提供决策依据，促使节能改造有计划地进行．

英文摘要：

In comprehensive consideration of the existing residential building in the City of Xi＇an and the service life after energy saving renovation, the reasonable energy saving range is determined. Analytic Hierarchy Process is used based on the properties of existing residential buildings to establish theirs energy saving evaluation index system , and fuzzy com- prehensive evaluation method is applied to build the existing residential building energy saving project model. This may provide a basis for making prior selection for existing residential buildings in Xi＇an.