NIRS technique is applied to the measurement of total sugar,reducing sugar,nicotine,total nitrogen,potassium and chlorine contents in tobacco cut.These contents can be measured with NIRS which is combined with PLS method.Analysis model has been established and the model parameters are optimized with internal cross test method.The model can directly predict the content of total sugar,reduced sugar,nicotine,total nitrogen,potassium and chlorine in tobacco cut.The average relative errors of total sugar,reduced sugar,nicotine,total nitrogen,potassium and chlorine are 2.2%,2.37%,1.82%,2.22%,3.68% and 3.30% respectively.Their variation coefficients are less than 3.5%.The repeatability and accuracy of the established model are tested.The results show that the model is accurate,reliable and convenient.The method is nondestructive to tobacco cut and decreases dust pollution.It can be used to directly detect the tobacco cut in batch and monitor the quality of cigarette blend.