本文以系统动力学的观点着重分析了农业系统的子系统，即农业耕作机械和农业运输机械的系统动力行为；并以拖拉机、农运车系统动力对道路所产生的负效应，借以告诫人们：对农业耕作机械及农业运输系统的动力行为作某些必要的自系统控制和社会总系统的相应控制，有利于提高农业系统内部耕作面积的历史步进参数，促进农业结构内部的发展，同时可以预防和减少道路交通事故，提高道路服务水平，洁净交通环境． This article focuses on the dynamics of the system analysis of the subsystems of agricultural systems, that is, agricultural farming machinery and agricultural transport machinery system dynamic behavior; and tractors, agricultural vehicles on the road to the negative effects of the system to warn people: Making some necessary self-control of the dynamics of farming machinery and agricultural transportation systems and the corresponding control of the total social system are conducive to improving the historical step-by-step parameters of the farming area within the agricultural system and promoting the development within the agricultural structure. At the same time, Prevent and reduce road traffic accidents, improve the level of road service and clean the traffic environment.