This paper was focused on the effects of different adding water ratios in first, second and third process on proportion of long strands of expanded cut tobacco during humidition of tobacco process. The proportion of long strands was defined to be the reference index for the study item. The experiment was designed by DOE, and the final results were analyzed through the method mixture design. The results showed that parameter setting by different adding water ratios could influence the proportion of long strands significantly .The equation we got was tested significantly and effective. Under the condition of same quantity of adding water, the best ratio of adding water was 34 in fist, second and third humidition of tobacco process. Under the very condition the proportion of long strands of expanded cut tobacco could be produced at the exit of humidition of tobacco process.%以膨胀丝整丝率指标为参考,通过DOE试验设计,运用混料设计分析法,在加水总量不变的前提下,研究一、二、三区不同加水比例参数设置在膨胀线叶丝回潮工序对膨胀丝整丝率的影响.结果表明,一、二、三区不同加水比例参数设置对膨胀丝整丝率影响显著,回归方程模型显著且有效；在加水总量不变的前提下,叶丝回潮一、二、三区最佳加水比例3∶4∶3.该条件下,叶丝回潮出口膨胀丝整丝率最高.
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