Abstract: In this testing research, with orthogonal design, it is prepared a high strength concrete (C50) with RA andstudied the influence of water -binder ratio, content of RA, silica fume andfly ash onworkability and compressive strength ofrecycled aggregate concrete (RAC). Testing result shows that slump increases with increasing of water -binder ratio anddecreasing of content of RA and silica fume, fly ash has little effect on slump. Compressive strength develops with thedecrease of water -binder ratio and increase of content of RA and silica fume, fly ash has little effect on compressivestrength. With the development of hydration, the disadvantage effect of RA on compressive strength will reduce.