Dynamic mechanical thermo-analysis (DMTA) is an effective approach to evaluate the viscoelastic behaviour of materials. In this paper, DMTA of cement and asphalt mortar (CA mortar) with different asphalt to cement ratios (A/C) and water to cement ratios (W/C) was performed within a temperature range of -40 to 60 degrees C. The results demonstrate that the storage modulus E' gradually decreases with increasing temperature. At the same temperature, E' decreases with the increase of A/C and W/C, with the decreasing trend becoming gradually more pronounced. The loss modulus E '' of CA mortar increases initially but subsequently decreases with an increase in temperature. E '' gradually increases with an increase in A/C and W/C at the same temperature, though the increasing trend with W/C is less pronounced. The variation of the loss factor tans is similar to that of and the temperature corresponding to the peak points of tans is slightly higher than that of E ''. (C) 2017 Elsevier B.V. All rights reserved.