Abstract: The combination of methods of agricultural system engineering and traditional agricultural climatic analysis is used for studying the types of agricultural climatic disaster and decreased rates of crop yields caused by the hit of natural adversity in Hailun county, Heilongjiang province. The mathematics model of rational planting ratio in order to fight disaster and get stable yields has been found.Optimization treatment was computerized. Basing on the results mentioned above,several strategic plans aiming at different conditions have been suggested. After the examination of effectiveness with historical data, the results off the study have been recommended to the local production leadership denartments.