It is a traditional concept in China to have more children and more happiness, but with the intensification of social transformation and changes in family structure, does more children mean more happiness? This paper selects the effect of the number of children on the elderly's retirement preference and well-being in my country as the research starting point, uses the data of the China Health and Retirement Longitudinal Study (CHARLS) in 2015 and 2018, adopts an ordered probit model, and selects the number of children as the core explanation. Variables, the basic characteristics of respondents and their families, the pension status of the elderly, etc. are used as control variables to conduct an empirical study on the elderly's pension preference and well-being. The results showed that under different conditions, the elderly choose different ways of supporting the elderly. The results of this paper also support the conclusion that "more children may not be more happiness". After adding control variables such as the education level of the elderly, whether the elderly receive pensions, and whether the elderly are married and live with their spouses, the number of children The effect on well-being of older adults was no longer significant. Finally, relevant policy suggestions are put forward according to the research conclusions.