Abstract: It is of great significance to explore farmers' adoption behaviors of agricultural socialized services, to promote the transformation of farmers' effective demand into actual behavior, to improve local agricultural socialized service policies, and to promote the organic connection between small farmers and the development of modern agriculture. Based on 630 field survey data in Zhoukou, Henan Province, a major grain producing area, this paper empirically analyzed the impacts of capital endowment on farmers' adoption behaviors of agricultural socialization services and discussed the impact differences among different family life cycle stages by the MLR model and the group-level regression model. Results show that: 1) farmers' average adoption degree of agricultural socialization services in sample areas is 0.441, which is at a medium level; 2) the comprehensive capital endowment and all five different types of capital endowments have significant positive impacts on farmers' adoption behaviors of agricultural socialization services; and 3) the impact of capital endowment is significantly different among different family life cycle stages: in the fostering period, human capital and psychological capital have significant positive impacts, in the burdening period, human capital and social capital have significant positive impacts, in the stable period, natural capital, social capital, economic capital and psychological capital have more significant positive impacts, and in the maintenance period, all five types of capital endowments have significant positive impacts on their adoption behaviors. Therefore, this paper provides some policy suggestions, including comprehensively improving the level of farmers' capital endowment in multiple channels, fully considering the differences of farmers among different family life cycle stages, and improving farmers' adoption of agricultural socialization services through various measures.