Cementitious materials are important to enhance the performance of concrete. The adaptability between cement fly ash(C FA) and aggregate(S/A—soil and old asphalt) in recycled asphalt pavement materials(RAP) was studied. The test results show that the dynamic elastic modulus of RAP decreases with increasing temperature and decreasing loading frequency. When mA/mS is 1/55/5, the use level of cement is 2%6%(by mass), that of fly ash is 5%6%(by mass), better adaptability can be achieved between aggregates and C FA materials. When mA/mS is 2/53/5, softness coefficient of RAP is over 075, better water stability can be obtained.