In order to predict the residual life of hydraulic motors for construction machinery,a residual life prediction method was proposed based on volumetric efficiency,Wiener process and support vector machine regression.The whole life test of the hydraulic motor was carried out,the nonlinear support vector machine regression algorithm was used to process the original data,and the Wiener process model was established based on the maximum likelihood estimation method and the Bayesian update strategy,and the remaining life prediction of the hydraulic motor was completed.The results show that the volumetric efficiency of the hydraulic motor has a significant downward trend with the change of impacts number,the nonlinear support vector machine regression improves the regularity based on considering the randomness of the degradation data,and the residual life prediction method based on Wiener process can accurately and reliably predict the remaining service life of the hydraulic motor.