Abstract: Some of established standard farmland in Zhejiang Province did not achieve the standards of high-yield fields due to placing more emphasis on quantity than quality and reconstruction than management. In order to ensure food security, investigation and grading of the established standard farmland was carried out by the agricultural departments in Zhejiang Province. This paper put forward the methods of grading of land fertility and index system for investigation of farmland fertility, and developed a software system for achieving data managing, evaluating and analyzing. The results of investigation showed that the first, second, third standard farmland accounted for 33.2%, 60.7% and 6.1%, respectively. Through testing in the field, evaluation results agreed with the actual production. This work provides a scientific basis for improving the quality of standard farmland in future．

Key words: standard farmland, investigation of land fertility, gradation and classification