In order to solve the problem of high cost and high dependence on foreign technology, two warm mix agents A and B were developed and the basic road performance of the two new warm mix modified asphalts was studied. The mixing and compaction temperatures of them were determined. The three main indicators （penetration, ductility, softening point） of the two new warm mix asphalts were compared to other warm mix asphalts. The mechanism of the two warm mix modified asphalts was probed using FTIR test and TG test. Results show that: the penetration of asphalt can be reduced and the softening point can be raised significantly with the addition of the two warm mix agent. Agent A has some impact on the low temperature property of asphalt, but it still meets the requirements in relevant standard. The low temperature property of asphalt can be improved by agent B. The adhesion between the two asphalts and aggregate is good. The construction temperature of asphalt mixtures can be lowered by using two warm mix agent. There is chemical reaction when the two warm mix agents are added into asphalt, which leads to a decline of viscosity of asphalt. The thermal weight loss of the two warm mix modified asphalt is more stable.