In order to screen varieties suitable for mechanized harvest, 23 millet varieties with different lodging resistance were used as materials. By investigating various traits of varieties, the relationship between plant height, fresh weight per plant, root dry weight, mechanical strength and lodging coefficient was analyzed, and the lodging resistance of the tested varieties was evaluated. The results showed that the root weight and mechanical strength of the plant were most closely related to the lodging coefficient. The greater the root dry weight, the greater the stem bending resistance, the greater the mechanical strength of the stem, the stronger the lodging resistance of millet, the more suitable for mechanized harvesting, which provided a theoretical basis for breeding millet varieties with strong lodging resistance.