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The grain crop rational layout schemes in various drought conditions are analyzed by means of the linear programming method, taking Balinzuo Qi in Inner Mongolia as an example of the typical farming-pastoral region. In order to verify the yield-increasing effectiveness of the schemes and decrease the planting risk, the comparison analysis and assessment of the results between crop rational layout and reality are made. It is proved that the actual yields of various crops increased through using the optimal schemes, and the yield increase is more evident when drought types were defined compared with the case without defined drought types. However, the crop yield increment is steady with the risk index being lower through adopting the random scheme when the drought type cannot be determined accurately.