农业经济发展水平关系到经营者对农机的购买力，使用农业机械的经济效益决定着经营者是否购买或使用农机，是农业机械化发展的内在动力；政府对农业、农机工业及农机科研与教育的扶持，是农业机械化发展的外在动力。中国农业机械化发展的各个阶段中，各种动力因素曾起着不同的作用，政府作为外在动力主体，应采取促进农业机械化发展的政策。%The level of agricultural economy development deciding the farmers' ability of purchasing farm machines, the profit of using farm machines deciding if the farmers buy the machines, both of the two factors are the inside power to farming mechanization; The supported to the agriculture, the industry of farm machine, the scientific research and the education of farm machines is the outside power. Each power makes different effect in developing period of farming mechanization of China. The government, as the major factor in the outside power, should take the policy to advance the development farming mechanization.
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