Viscosity is an important physical parameter of waterbased drawing oil.The production of different stamping steel needs different viscosity of drawing oil,so it is necessary to establish a model to control the viscosity of drawing oil.Waterbased oil is a mixture of Newtonian fluid and nonNewtonian fluid.In order to establish a model that can be used to predict the viscosity of the mixed system,waterbased drawing oil samples with different proportions were prepared and their viscosity at different temperatures was tested.Bingham model,Cragoe model,Arrhenius model,Kendall-Monroe model and ASTM two parameter model were used to predict the viscosity of waterbased drawing oil.It is found that ASTM two parameter model is more accurate to predict the viscosity of waterbased drawing oil.In order to improve the prediction accuracy of ASTM two parameter model,considering the influence of waterbased drawing oil composition ratio,the ASTM model was modified.The modified model is more suitable for viscosity prediction of mixed system containing Newtonian fluid and non Newtonian fluid.