In order to explore the dynamic characteristics of red clay subgrade under cyclic loading, taking Liuzhou red clay as the test object, the consolidated undrained dynamic triaxial were carried out on reinforced red clay under different reinforcement layers to study the influence of reinforcement layers on the dynamic characteristics of reinforced red clay.The test results show that the axial cumulative strain of reinforced red clay decreases with the increase of reinforcement layers, but the increase of reinforcement shows a decreasing trend. From the unreinforced sample, the decrease of axial cumulative strain of adjacent reinforcement layers is 14.5 %, 10.6 % and 6.4 %, respectively. With the increase of reinforcement layers and vibration times, the resilient modulus of reinforced red clay increases gradually, but the reinforcement effect on the resilient modulus of soil is not significant. The reinforcement can effectively reduce the volumetric strain of reinforced red clay, and with the increase of reinforcement layers, the reinforcement effect is more significant. Compared with the 2-layer reinforcement, the 3-layer reinforcement can reduce the volumetric strain by 75.0 %. The slope k of hysteresis loop is used to describe the stiffness and elastic properties of soil. With the increase of reinforcement layers and vibration times, the value of k increases slowly at first, and then increases rapidly, indicating that the stiffness and elasticity of soil are improved, but the reinforcement effect is not proportional to the reinforcement layers.