Abstract: Agricultural machinery service is an important division of labor in agricultural socialized service. In order to explore whether agricultural machinery service has a promoting effect on land scale operation, this study analyzes the mechanism of agricultural machinery service on land scale operation from the perspective of farmers. Taking three counties in northern Xinjiang Uygur Autonomous Region as the research area, the instrumental variables are introduced and the two-stage least square method is adopted. Combined with the quantile regression model, the heterogeneity of the impact of agricultural machinery service on land scale operation of different types of farmers is analyzed. The results show that agricultural machinery service purchase has a significant positive effect on farmers' land scale management. Land transfer plays an important intermediary role in the impact of agricultural machinery services on land scale management; the impacts of agricultural machinery services on land scale management of farmers with different planting scales and agricultural machinery assets are heterogeneous; with the expansion of farmers' planting scale, the impact of agricultural machinery services on land scale management gradually weakens. The increase in household agricultural machinery assets will also gradually weaken the impact of agricultural machinery services on farmers' land scale management.

Key words: agricultural machinery services, land scale management, farmers