改进了Ｄｅａｎ－Ｓｔｉｅｌ粘度模型，将该模型中的定值常数与物性参数相关联，选用状态方程求解粘度式中的密度．考察了Ｌ－Ｋ，ＳＲＫ，ＰＲ和Ｐ－Ｔ４个状态方程，其中，以Ｐ－Ｔ状态方程的计算结果为最好．用改进的方法计算了原油和馏分油的粘度，计算结果与实测数据比较表明，该方法能够较为准确地预测原油及馏分油粘度，平均相对误差为５．１５％． The Dean-Stiel viscosity model is modified. The constants in the model are correlated with the physical parameters. The equation of state is used to solve the viscosity in viscosity. The state equations of L-K, SRK, PR and P-T4 were investigated. Among them, the result of P-T state equation was the best. The viscosity of crude oil and distillate oil was calculated by the improved method. The calculated results are compared with the measured data. The results show that the method can predict the viscosity of crude oil and distillate oil with the average relative error of 5.15%.