In this paper, we studied changes of specific leaf weight of top-three leaves, i.e., the flag leaf, second leaf,third leaf, and the relationship between the specific leaf weight at the kernel-filling stage and yield of five foxtailmillet varieties with different growth period. The results showed that the specific leaf weight of top-three leaves de-creased significantly during the kernel-filling stage, varieties with long growth period decreased the slowest, inter-mediate type the second, and varieties with shorter growth period decreased the fastest. Specific leaf weight and con-tribution yield during the kernel-filling stage were positively correlated in foxtail millet, the correlation were signifi-cant or extremely significant.