Xichang is always called "the spring city". It has higher requirement about sunshine spacing because of its geographical location and climatic conditions. When the sunlight spreading indoors, the metabolism of organisms can be promoted and more disease can be prevented and treat. Therefore, residential construction must have a minimum duration of sunshine. In this paper, we have confirmed the sunshine spacing coefficient about south and north direction of the residence in Xichang, and then we have done some analysis on sunshine spacing of some residence in Xichang.