Based on the analysis of RAP properties and the effect of RAP on the mixture,the influence of aging degree of asphalt,the asphalt content and percent of RAP in cold recycling mixtures with foamed asphalt on the performance of recycling mixtures was investigated.It is found that with the same content of foamed asphalt the more aged the waste asphalt,the bigger the air voids and the worse the ITS and water resistance.But the mixture containing RAP in which the waste asphalt is aged more seriously owns higher stability at 60℃,which indicates a better high temperature performance.In addition,with a fixed content of foamed asphalt,the more the content of RAP,the bigger the air voids of the mixture,and the worse the high temperature stability and water resistance.The results show that it is not good to have RAP as much as possible.In order to let the tensile properties and water resistance meet the requirements of heavy traffic,the content of RAP should not exceed 77%.In order to let the stability meet the requirement of heavy traffic,the content of RAP should not exceed 70%.