Through shear tests on small lead-core rubber bearings， the effects of bearing shear strain， compressive stress and load? ing frequency on the bearing's equivalent horizontal stiffness， post-yield stiffness， yield force and equivalent damping ratio are stud? ied. The results show that： With the increase of shear strain， the equivalent horizontal stiffness and the post-yield stiffness of the bearing decrease， the yield force increases， and the equivalent damping ratio decreases linearly； with the increase of the vertical compressive stress， the equal the effective horizontal stiffness decreases， the stiffness decreases linearly after yielding， and the yield force and the equivalent damping ratio increase linearly； the loading frequency has basically no effect on the shear performance of the bearing and can be ignored； within 100% of the shear strain， apply the shear strain and compressive stress did not cause dam? age to the isolation bearing； large deformation and large compressive stress above 100% shear strain will cause the bearing to enter into plastic， causing partial permanent damage to the bearing. Suggestions that the working conditions need to be designed accord? ing to the actual needs of the shaking table test are put forward. The correction coefficient of the Japanese code equivalent horizon? tal stiffness calculation formula is proposed， which is compared with the measured value of the shaking table test to improve the ac? curacy.