Abstract: In order to predict the freezing point of jet fuel rapidly，a method was developed to predict the freezing point of jet fuel (140-240 ℃) based on the gas-chromatogram of crude oil directly. Gas chromatograms of 70 crude oils and freezing point data of 70 jet fuel fractions were collected. The retention time range of jet fuel fraction (140 - 240 ℃) in the gas chromatogram of crude oil was determined by boiling point cutting method. Multiple linear regression and stepwise regression were used to obtain the fitting formula of freezing point of jet fuel and contents of three n-alkanes and two non-n-alkanes in jet fuel fraction (140 ~ 240 ℃) in gas chromatography of crude oil，and the accuracy and repeatability of the above formula were verified. The results showed that the deviation between the predicted and measured freezing point was with in ±1.3 ℃，the repeatability was within ±0.69 ℃,indicating the good accuracy and repeatability of the method.

Key words: crude oil, gas chromatography, jet fuel, freezing point