In order to study the creep model of cement emulsified asphalt mortar (CA mortar), the creep curves of CRTS (China Railway Track System) I and II CA mortar under different stress levels were tested, and the applicability of several classical creep models to the creep of CA mortar was compared and analyzed. The results show that Burgers model is the most suitable model to characterize the creep characteristics of CA mortar. Considering the characteristics of asphalt phase in CA mortar, a modified Burgers model is established. The model parameters are linearly related to the stress level. Based on the model calculation results, the creep values of 50 mm thick I and II type CA mortar filling layer are 0.0325 mm and 0.0035 mm, respectively, under the environmental conditions of 25°C and 65% RH and the static load of 0.1 MPa.