Objective To measure the surface roughness of connecting rod bushings accurately. Methods Use the methods of gaussian filter and wavelet analysis to evaluate the surface roughness of connecting rod bushings, and compare the evaluation results with the measured results. Results The respective relative error of Gauss filter and wavelet method was 1 . 7046 % and 0 . 9037 % . Conclusion It was verified that both the gaussian filter and wavelet analysis were feasible for the evaluation of the surface roughness of connecting rod bushings, and the evaluation methods of the wavelet method were more accurate.