To investigate the creep properties of loess in highfill foundation under conditions of high stress and different depth, the CU triaxial creep tests of loess at Yan'an airport are carried out under conditions of different confining pressure. The creep curves of multistep constant load and the equaltime stressstrain curves are obtained by using "Chen method". The results indicate that the creep properties of the loess are obviously influenced by stress level. The stressstrain presents linear properties under conditions of lower stress, and shows nonlinear creep properties under conditions of higher stress. Taking the confining pressure 600 kPa for example, an empirical creep model is proposed in which the stressstrain is described by exponential function and the straintime is described by hyperbolic function. The result shows that the model proposed and the empirical data are high in fitting degree, simple in formality, few in parameters and easy in achievement, can further reflect and predict the creep properties of the loess at Yan'an airport engineering compared with SinghMitchell and Mesri models.