A Chinese little boy looked curiously at a retired elderly person practicing dancing. In recent years, China's persistently low birth rate and worsen aging population have become the most worrying topics in China. With the decline in birth rate, China's aging population problem is becoming increasingly severe. The pension system in China mainly relies on the contributions of employees, and the number of pension recipients has increased. The decrease in young labor force has also increased the burden on the pension system. This change will pose a threat to the sustainability of pension payments