Abstract: In order to test the influence of part-time business on the technical efficiency of farmer′s grain planting, based on the micro-survey data of peasant households, this paper used the stochastic frontier production function method in the form of super-efficiency production function to measure the technical efficiency of farmer′s grain planting. Then, based on the Tobit model, it analyzed the influence factors of technical efficiency. Results show that the loss of farmer′s technical efficiency mainly comes from management errors,and the technical efficiency of specialized farmer′s grain planting is significantly higher than part-time farmer′s;the order of input factor output elasticity is productive capital>labor force>land,and there is substitution relationship between labor force and productive capital, land and productive capital;part-time business and land fragmentation reduce the technical efficiency,while grain sowing area, condition of health and participating in the technical training improve the technical efficiency. Therefore, it is necessary to guide part-time farmers to withdraw from grain cultivation, regularly carry out technical training for farmers, improve the market of agricultural machinery socialized service, and enhance farmers′ ability to acquire information in technology and management.

Key words: part-time business, technical efficiency of grain planting, efficiency differentiation, stochastic frontier analysis, Tobit model