Based on the results of investigation in Gaoqiao demonstration region, the principle and direction of structure adjustment of plant farming are analyzed and discussed. It is considered that plant farming should not only concentrate on higher yield of grain. On one hand, plant farming should concentrate on its benefit raising, changing from the type of dress warmly and ear one's fill to the economy type, and from the economy type to the higher benefit type|On the other hand, plant farming should sustain grassland animal husbandry that is dominant commercial industry, changing from the plant type to the combination type of planting and breeding. The structure adjustment of plant farming should be based on the distribution and utilization of water resources, and bringing regional dominant commercial industry into full play, improving agricultural environment, constructing regional commercial and efficient ecological agriculture.