In this paper,the authors had analyzed the interrelationship between the climatic conditions and the yields of the main crops such as maize,soybean,and wheat in Heilongjiang province;established climate-yield model for yield with solar radiation,dryness index,and mean air temperature in July and August;also analyzed the variation coefficient of climate-yield relationship for various regions.On these bases,the authors determined the major planting regions for maize,soybean,and wheat;and studied the distribution structure of various crops in these major planting regiongs by means of the linear programming method.Consequently,the climatic bases for rational distribution of crops were provided.