The aging phenomenon of the Chinese population has become increasingly serious. A systematic study of the effect of grandparents’care-giving on the working time of adult children can help academic circles to better determine the overall role of aging in society, construct a more positive view of aging. The existing studies mainly focus on the gender differences in the effect of grandparents’ care-giving, but ignore the problem that the heterogeneity of employment sector may change the choice of adult children’s working time, which leads to the misjudgment of the effect of care. As a result, according to the characteristics of agriculture and non-agricultural sectors, this paper constructs a labor decision-making model considering the characteristics of grandparents ’care-giving behavior and work flexibility, and uses CFPS non-equilibrium panel data for the two periods 2014 - 2016 to construct a mixed regression model to test the hypothesis. The results show that grandparents’ care-giving does have different effects on agriculture and non-agricultural employment sectors because of the different compatibility of working families, In non-agricultural employment sector, because men rarely engage in housework, care behavior only improves female labor time by reducing the cost of job opportunities; while in agricultural employment sector, men need to consider both family and work, and intergenerational care has a positive impact both on men’s and women’s working time.
