Based on the study of water-saving retrofitting of existing residential buildings and domestic and
foreign research results, the paper developed a comprehensive evaluation index system for
water-saving retrofitting of exiting residential buildings, and it provides an evaluation basis for
choosing the optimal water-saving project. Of course, in different area, the weather conditions and
human dimensions are different, so we need to adjust the evaluation indexes and their weight when it is
necessary. In addition, we should pay attention to water-saving design and optimization in new
residential buildings.