Abstract: A new generation of nuclear magnetic resonance online analyzer was introduced by SINOPEC Jiujiang Company for the analysis of physical properties of crude oil and its distillates.Through the understanding and analysis of the new generation NMR online analyzer，a corresponding mathematical model，which associates the nuclear magnetic spectrum with the oil property data，was established to analyze the physical properties of crude oil and its distillates.Compared with that of the conventional method，it showed that the data reproducibility is within the allowable error range of the analysis method.

Key words: nuclear magnetic resonance analyzer, mathematic model, crude oil and distillate, physical property