长期以来，我国农机的普及率较低，而且主要集中在北方及中原的平原地区，而高原地区，由于地形复杂，不适于大面积耕作，从而严重制约了农机的使用和推广。随着改革开放的不断深入，高原山区大批的打工人员涌入城市，造成了劳动力的短缺，同时，由于分产到户，采用牛耕马... For a long time, the popularization rate of farm machinery in our country is relatively low, and it is mainly concentrated in the plains of North China and the Central Plains. However, due to the complicated terrain, the plateau is not suitable for large-scale cultivation, which seriously hinders the use and promotion of agricultural machinery. With the continuous deepening of reform and opening up, a large number of migrant workers in the plateau mountainous areas have poured into cities, resulting in a shortage of labor force.