Rubber concrete is concrete formed by using rubber particles as additional aggregates， and its unique physical properties and strengthening effects have led to its increasing popularity and application in civil engineering. To study the feasibility of rubber concrete as a pile cap in the pile-bearing low embankment system， this paper prepared rubber concrete specimens with different rubber particle sizes and volume content， carried out a series of static compressive tests and hysteresis test under cyclic loading， and obtained mechanical property indexes such as compressive strength， hysteresis dissipation， damping loss factor， dynamic modulus of elasticity etc.， and their changing rules with rubber particle size and volume content. It is found that with the increase of the volume content of rubber particles， the compressive strength and dynamic elastic modulus of rubber concrete specimens gradually decrease exponentially to a critical value， which is related to the size of rubber particles. The smaller the particle size， the lower the strength and dynamic elastic modulus. The hysteresis energy consumption and loss factor show a quadratic trend with the rubber particle content， increasing first and then slightly decreasing， and reaching a peak at around 8% to 10% of the rubber particle content. Compared with the loading amplitude level， the influence of particle size on energy consumption is relatively small.