Using the data of meteorology and crop yield in 100 meteorological stations in Northeast China from 1971 to 1990, the climatic adaptability of main food cropps are analysed and the climatic productivity are calculated. The results showed that the agroclimatic productivities for each crop are higher or highest ic the middle plain part of Northeastern China. hut in the northern part of 50°N and near by the Tianchi of Changbai Mountain are the lowest. At last,the structure patterns of main cropps are adjusted by using linear programming. The theory analysis of results showed that the structure adjustment is more beneficial to higher yield I stability and higher value.