Rutting deformation of asphalt pavement under heavy trafficking at both high and ambient temperatures was evaluated qualitatively and quantitatively through an accelerated pavement testing(APT) with MLS66(mobile load simulator 66). The results show that the compression rutting deformation from secondary compaction in the initial loading stage is up to 1/3 1/2 of the total rutting depth. At the high temperature, the compression rutting deformation rate is one order of magnitude higher and its average increase rate of rutting depth and average rate of pit deformation in the stable loading stage are approximately 2 times and 5 times that at ambient temperature respectively. In the stable loading stage，the average ratio of uplift area to total rutting area at high temperature is about 040, while the ratio is 045 at ambient temperature. It suggests that maintenance management plan can be made according to the estimation of the rutting development based on the average increase rate of rutting depth. For the modified asphalt mixture, extreme high temperature deformation resistance requires to be tested. The occurrence and the type of rutting can be judged with the changes of rutting area and volume of air void, and the composition design of middle layer needs an improvement with high modulus asphalt mixture.