The government subsidized the introduction of intelligent systems for the introduction of existing buildings. As of the end of 107, a total of 291 improvement cases were completed. However, from the existing residential community subsidized by the Ministry of the Interior's Architectural Research Institute, the intelligent system was improved and operations were found to promote It is very difficult to introduce a smart system into a residential community. Therefore, this study uses a case study of the introduction of a smart home system into a residential building to bring together the intelligent system often introduced by the existing residential community and the cost of introducing various intelligent systems. And the benefits obtained after the introduction, as a reference for the introduction of other existing residential communities interested in introducing intelligent systems, so that people can understand and understand the substantial benefits of the introduction of intelligent improvement in existing residential communities, and expect residents to import intelligent systems. Enjoy a better living space.