This paper explores the impact of retirement on individual's residency model based on the data from the China Health and Retirement Longitudinal Study (CHARLS) of 2013 and 2015. The results show that retirement significantly reduces the probability of individual's sharing co-residence with their children, and the male individuals are more affected. China has entered an aging society, the welfare of the elderly has received widespread attention, and children should pay more attention to the elderly so that they can live happily in their old age. KeywordsRetirement, Co-Residence, CHARLS IntroductionBy 2000, people aged over 60 and 65 were 10% and 7% of the population in China respectively (China Statistical Yearbook, 2001), indicating that China had entered an aging society, and the proportion of the elderly had increased year byyear. By the end of 2017, people aged over 60 had exceeded to 241 million, accounting for 17.3% of the total population, people aged over 65 had a population of more than 158 million, accounting for 11.4% of the total population, higher than the international "aging society" standard; both aging population and the elderly dependency ratio are increasing year by year (Table 1). Since China had entered an aging society in 2000, the size and proportion of the elderly population have grown at a relatively rapid rate, and their residency model has received more and more attention. Based on the data of the China Health and Retirement Longitudinal Study (CHARLS), this paper analyzes the impact of retirement on the individual's residency model of the elderly, what's more, the impact from the perspective of overall and different genders will be conducted, and it explores ways to improve their lives and welfare of the elderly.