In order to study the influence of different water and nitrogen coupling on the leaf area index ( LAI) of flue-cured tobacco, thirteen water and nitrogen coupling treatments were designed according to the growth habit of flue-cured tobacco, dy-namic simulation was conducted for the leaf area index of flue-cured tobacco by establishing cosine model, exponential model and linear model on the basis of time ( t) after transplantation, detection and comparison were carried out for the models by utilizing root-mean-square error ( RMSE) , correlation coefficient ( R-square) and crop growth law.The results showed that root-mean-square error between the simulated value and measured value of exponential model was the smallest, only 0.0712~0.1325, the correlation coefficient was the highest, reached 0.9914~0.9975, which meet the crop growth law and could predict the dynamic change process of flue-cured tobacco leaf area index.Different water and nitrogen coupling existed an obvious influence on the leaf area index of flue-cured tobacco, the irrigation volume and nitrogen application rate present positive correlation with the leaf area index of flue-cured tobacco, but excessive application of irrigation volume and nitrogen would restrict the growth and development of flue-cured tobacco to some extent.Under the same irrigation volume and nitrogen application rate, the maximum leaf area index ( LAIM ) gained via drip irrigation under membrane increases by 16.76%compared with the traditional furrow irrigation, drip irri-gation technique under membrane could promote the growth and development of flue-cured tobacco.%为了研究不同水氮处理对烤烟叶面积指数的影响，依据烤烟生长习性设计了13种水氮处理方式，并且基于移栽后时间建立了余弦模型、指数模型和线性模型来对烤烟叶面积指数进行动态模拟，利用均方差、相关系数以及作物生长规律对模型进行检测与比较。结果表明：指数模型的模拟值与实测值之间均方差最小，仅为0．0712～0．1325，相关系数最高，达到0．9914～0．9975，且符合作物生长规律，能够很好地预测烤烟叶面积指数的动态变化过程；不同的水氮处理对烤烟叶面积指数产生显著影响，灌溉量和施氮量大体上与烤烟叶面积指数呈现正相关，但是两者的过多使用会在一定程度上抑制烤烟的生长发育；同时，在相同灌溉量和施氮量条件下，膜下滴灌方式所得的最大叶面积指数比传统沟灌的增大了16．76％，说明膜下滴灌技术对烤烟的生长发育起到了很好的促进作用。
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