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采用n－d－M法、Brown－hadner法和~1HNMR／IR法分别对6种重质油的结构进行了研究，通过IR光谱并结合~1HNMR波谱获得脂肪H／C原子比H_S／C_S即x值。对三种不同的方法测定重质油结构进行比较，结果认为~1HNMR／IR法相对于Brown－Ladner法可以得到更为准确的平均分子结构参数。n－d－M法对一些较低分子量物质，可以给出正确的分子结构参数，但由此所得有关分子结构信息有限。
The structures of six heavy oils were studied by n-d-M method, Brown-hadner method and ~ 1HNMR / IR method respectively. The H / C_S ratio of H / C was obtained by IR spectroscopy and 1HNMR spectroscopy x value. The results of three different methods for the determination of heavy oil were compared. The results show that ~ 1HNMR / IR method can obtain more accurate average molecular structure parameters than Brown-Ladner method. n-d-M method for some of the lower molecular weight substances, can give the correct molecular structure parameters, but the resulting molecular structure information obtained is limited.