通过对两种不同的计量模型结果进行对比分析，找出影响粮食主产区粮食生产技术效率的主要因素。
Through comparing with two different measurement and analysis model, finally find out major factors of affecting technical efficiency in main grain producing districts.
研究发现：（1）全国粮食生产技术效率时际上表现为下降且下降主要是由于高效率组县（市）的技术效率下降引起的；
Results indicated that:(1) the technical efficiency of nationwide declines, which is caused by the decrease of high efficiency group.
研究发现：（1）全国粮食生产技术效率时际上表现为下降且下降主要是由于高效率组县（市）的技术效率下降引起的；
Results indicated that:(1) the technical efficiency of nationwide declines, which is caused by the decrease of high efficiency group.
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