基于2018年CHARLS数据，运用IV-Tobit模型，从代际支持视角重新审视子女外出对农村老人农业劳动供给的影响及作用机制。研究发现，子女外出务工显著增加了农村老人农业劳动供给，不控制内生性将会低估这一影响。机制分析表明，子女外出对农村老人农业劳动供给存在子代生活照料缺失的劳动力替代效应、代际经济支持净值的收入效应和父代隔代照料的农业生产挤出效应，其中劳动力替代效应占主导地位。异质性分析发现，受“责任伦理”的影响，子女外出会显著增加代际经济资源向上流动和向下流动家庭中老人的农业劳动供给。因此，需深刻认识到劳动力流动对农村传统家庭养老体系的冲击，进一步完善农村养老体系，倡导创建平衡的代际关系。

Using the 2018 CHARLS data and the IV-Tobit model, the perspective of intergenerational support is introduced to re-examine the influence and mechanism of children’s migration on the agricultural labor supply of rural elderly. The study finds that children’s migrant work has significantly increased the agricultural labor supply of the rural elderly, and uncontrolled endogeneity will underestimate this effect. The mechanism analysis shows that children 's migrant affect the agricultural labor supply of the rural elderly, through the labor substitution effect of the lack of child care, the income effect of intergenerational economic support net value, and the agricultural production crowding out effect of parent-child care, among which the labor substitution effect is dominant. The heterogeneity analysis shows that under the influence of “responsibility ethics”, children's migrantation significantly increase the agricultural supply of the elderly in families with upward and downward flow of intergenerational economic resources. Therefore, it is necessary to have a deep understanding of the impact of labor mobility on the rural traditional family pension system, further improve the rural pension system, advocate the creation of a balanced intergenerational relationship.

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国家自然科学基金面上项目（71973154）；教育部规划基金项目（19YJA840006）