The China Health and Retirement Longitudinal Study (CHARLS) aims to collect a set of high-quality microdata representing families and individuals aged 45 and over in China to analyze the ageing of China's population and promote ageing. Interdisciplinary research on the issue of chemistry. The CHARLS National Baseline Survey was launched in 2011 and covers 150 county-level units, 450 village-level units, and 17,000 of the approximately 10,000 households. These samples will be tracked every two years, and one year after the end of the survey, the data will be launched for the academic community.

 CHARLS official website：http://charls.pku.edu.cn/en