In order to explore the effect of RAP content on the road performance of plant-mixed heat recycled asphalt, the optimal asphalt under different conditions is determined by mix ratio design, and the main road performance are experimentally analyzed. The results show that: 1) The dynamic stability coefficient of recycled asphalt mixture increases with the increase of RAP content, and when the content increases from 20% to 50% , the dynamic stability increases 47.1% ; 2) In the process of increasing the RAP content from 20% to 50% , the tensile strength of the recycled asphalt mixture increases 20.16% , but the tensile strain decreases 31.37% , the stiffness modulus increases 79.94% , and the low-temperature crack resistance no longer meets the requirements of the specification when the content exceeds 40% . 3) The RAP content will reduce the water stability of the recycled asphalt mixture, and the residual stability ratio reduces 7.94% when the content is increased from 40% to 50% . The results can provide a certain reference for application of recycled asphalt mixture in highway pavement engineering.