Abstract:To 2020,a national increase of 50 million tons is to be targeted in grain production,one-third of which depends on the great contribution of the Huang-Huai-Hai region.Tapping into the production potential of large-area medium and low-yield fields has become the most principal strategy for the increase of grain production capacity.However,current experiences and technologies in the improvement of medium and low-yield farmlands,with the large transfer of the rural labor force and the deep transformation of the agricultural production pattern to large-scale development and modernization,could not meet the needs in the new situations.In thisstudy,a new generation of controlling techniques for the improvement of medium and low-yield fields,aimed at the settlement of thorny problems in the improvement of medium and low-yield fields,has been developed and integrated,named "double leaping over technology for the raising of soil fertility and grain production",based on the multi-year studies in Fengqiu,Henan Province.These techniques were demonstrated and extended in the improvement of 13 thousand hectare medium and low-yield fields with tremendous benefits in grain production increase,which provides a model for the large-area increase of grain production in Henan and the Huang-Huai-Hai regions as a whole.The provincial government of Henan is set to adopt such technology in the new-round improvement of medium and low-yield fields.