Abstract: In recent years, the cross regional services of China’s grain production is continuously shrinking, and the“dual scale”(providing intra-regional scaled outsourcing services while transferring to large-scale cultivation of land) operation style is increasingly visible. On the basis of comparing the differences in economies of scale between two types of service forms, this paper analyzes the theoretical logic of China’s grain production outsourcing service supply transformation, and uses thematic research data from 504 outsourcing service organizations in Jilin, Jiangsu and Sichuan, provinces to test the differential impact of large-scale operation of farmers on the cost and benefits of different forms of outsourcing services. The research results indicate that the substitution of intra-regional services for inter-regional services is a fundamental trend in the present transition of outsourcing service supply. The large-scale operation of farmers, characterized by concentrated and contiguous plots of land and the expansion of the total area of household operations, is an important reason for the transformation of outsourcing services from cross regional to intra regional. From the perspective of the internal mechanisms, although large-scale operation of farmers has a cost reducing and efficiency increasing effect on both intra-regional and inter-regional services, the marginal benefits of intra-regional services are higher than those of inter-regional services. Therefore, policy support should be provided for the transformation of outsourcing services from three aspects: further strengthening the quality of concentrated land parcels, improving the flexibility of policy adjustments to support the development of outsourcing services, and breaking the constraints of regional concepts to enhance regional exchanges and cooperation.

Key words: scaledoperation, relative economies of scale advantages, intra-regional services, inter-regional services