The main composition of gasohol is studied by FT-NIR combined with PLS method in this paper.The ethanol content is84.5%~98.2%(φ),and the gasoline content is0~15%(φ).Through the established PLS model,the final model determination coefficient R 2 is obtained as0.9969for ethanol and0.9939for gasoline.The calibration set and validation set standard error for ethanol are0.23and0.38,while0.38and0.39for gasoline.Predication result for the lower content impurity acetone is also satisfied.It is demonstrated that NIR...