Abstract: In this paper, a RUL prediction technology based on the fusion of the state data and the failure data is proposed. The RUL prediction is carried out with the rolling bearing components of the charging pump of nuclear power plant as the case of test.This paper demonstrates that the life prediction technology of equipment components based on the Weibull proportional covariate model can accurately predict the RUL of the rolling bearing of the charging pump, and provides a feasible idea for the application of the RUL prediction in nuclear power plant.