In the dynamic characteristic test of sliding bearing,the test-bed parameters have an important influence on the test accuracy.An inverted dynamic characteristic test rig was taken as the research object,and a simulation evaluation method for the identification accuracy of the dynamic characteristic coefficient of the sliding bearing was proposed based on the forward and reverse problem of bearing dynamics.The influence of the constraint stiffness and constraint damping of the test bench on the identification accuracy of the dynamic characteristic coefficient of the bearing at different excitation frequencies was analyzed,and the range of excitation frequency and constraint parameters was optimized.The results show that at lower excitation frequencies,when the constraint stiffness and constraint damping of the test bench are small,the identification accuracy of the dynamic characteristic coefficients is not significantly affected by testing errors.As the constraint stiffness and constraint damping increase to a certain value,the identification accuracy of the dynamic characteristic coefficients is rapidly increased by the influence of the test errors.For this studied test bench,when selecting an excitation frequency between 30 Hz and 300 Hz,selecting the test bench constraint stiffness less than 0.3% of the test bearing stiffness,and the test bench constraint damping less than 7% of the test bearing damping,a good testing accuracy of the bearing dynamic characteristic coefficient can be ensured.