Abstract: Through questionnaire on the willingness,reasons,effect and contents of energy efficiency retrofit for existing residential buildings in Xi'an,the indoor thermal environment and resident satisfaction about indoor thermal environment was analyzed.Results show that the indoor thermal environment was poor in winter,the residents were not satisfied with the indoor thermal environment,the willingness of retrofit was strong,and the effect of retrofit was obvious.According to the survey results,the building envelope,heating metering device,temperature regulating device,heat source were reconstructed in five communities,which attracted the attention of the majority of residents.Building's energy consumption was significantly reduced.Then,the requirement and key contents of retrofit had been pointed out.