根据成熟农作物各种统计数据，采用多元统计的方法，给出了成熟农作物（以小麦、水稻为例）田间生长空间分布的数学模型结构，并进行了计算机仿真，以描述农作物（包括茎秆、穗头和籽粒）在田间的分布状态。该数学模型可用于进一步研究在计算机上仿真联合收割机收获作业时机具与作物的相互作用。 According to the statistics of mature crops, the mathematical model structure of the spatial distribution of mature crops (wheat and rice) was given by using multivariate statistics. The computer simulation was conducted to describe the distribution of crops (including stems, Spike head and grain) in the field distribution. This mathematical model can be used to further investigate the interaction of the implement with the crop when harvesting the combine harvester on a computer.