With the application of simple performance tester(SPT) the dynamic moduli and phase angles of asphalt mixtures with different warm mix agents(Leadcap，Sasobit and ZQ WB3 warm mix agent) added separately and hot mix asphalt mixture were analyzed at different temperatures and loading frequencies. The fatigue lives of asphalt mixtures with different warm mix agents added were analyzed by four point bending test(strain control mode).The results show that the dynamic moduli of asphalt mixtures with different warm mix agents added increase with the temperature decreasing or the loading frequency increasing.When the phase angle of asphalt mixture with warm mix agent added comes to a maximum the loading frequency of asphalt mixture with Leadcap or Sasobit warm mix agent added is smaller than that of asphalt mixture with ZQ WB3 warm mix agent added at the temperature of 37℃ or 54℃.The warm mix agent has a great effect on the fatigue life of asphalt mixture.The average fatigue life of the asphalt mixture with ZQ WB3 warm mix agent added is the shortest,and that of the asphalt mixture with Leadcap warm mix agent added is the longest.