中文摘要：

运用随机前沿函数和技术效率损失函数考察了2002-2008年全国及19个省份的粮食收入性补贴对小麦生产技术效率的影响，进一步计算了粮食收入性补贴对小麦生产技术效率影响的非单调效应。结果显示：1）小麦生产技术效率总体较高，在东部、中部、西部与东北地区之间，以及在主产省与非主产省之间，小麦生产技术效率都存在明显差异；2）从全国层面看，粮食收入性补贴导致了全国小麦生产技术效率明显降低；且随着补贴强度增加，对小麦生产技术效率损失的影响呈现增强趋势；3）从观测的19个省份看，只有4个省份的粮食收入性补贴有助于提高小麦生产技术效率，其余15个省份都导致了小麦生产技术效率不同程度的降低；4）小麦生产技术效率损失可能是小麦收入性补贴强度和是否与小麦生产挂钩、是否实施小麦最低收购价政策共同作用的结果。今后，应以粮食收入性补贴政策改革为契机，向扭曲程度较小的“绿箱”补贴转型，发挥补贴对提高粮食全要素生产率的促进作用。

英文摘要：

Applying a stochastic frontier model with non-monotonic efficiency effects, this paper analyzed the impacts of grain specific income subsidy on technical efficiency of wheat production during the period from 2002 to 2008 in China. Results show that： 1） average technical efficiency of wheat production is high in China, but significant differences exist among provinces and regions; 2） from a national level, grain specific income subsidies lead to a decrease in technical efficiency of wheat, with the marginal effect increasing as subsides rising; and 3） among 19 provinces, positive effects of income subsidies exist only in four provinces and negative effects exist in other 15 provinces to different extent. These two different effects are combined results of three major grain policies, including income subsidy, minimum purchase price, and contingent storage. For the future of grain production, the Government should transform income subsidies targeted on grain production into ＂Green Box Policies＂ according to WTO rules.