During the period of 1992^ 1994, the study on remaking of low-middling yield farmland, which is regarded as a part of Hongni river valley, was carried through transforming ecological environment, improving agricultural productive condition and applying agrotechniques.By combining ecology .production with science and technology, the structure of ecosystem, the productive function of farmland and economic effect in Hongni river valley has been improved obviously.Basing on that, the direction and measures to be taken in the further remaking of lowmiddling yield farmland were suggested.