Aiming at the problems of large subjectivity,insufficient accuracy and the need for a large amount of prior knowledge in the comprehensive evaluation and analysis of the reliability of five coordinate CNC machine tools,a combined evaluation method of best worst method (BWM) and fuzzy analytic hierarchy process (FAHP) was proposed.The CNC machine tool was divided into nine subsystems,and the failure data of each subsystem was statistically analyzed to calculate the point estimates of mean time between failures (MTBF),mean time to first failure (MTTFF),mean time to repair (MTTR),intrinsic reliability (A) and ease maintenance index (K).The reliability of the machining center,the comprehensive weights and influencing factors between the reliability indicators and each subsystem were determined,and the proposed method was applied to quantitatively evaluate the reliability level of the machining center.The influence degree and influence factor of the feed system Sj are higher than those of other subsystems,indicating that the feed system Sj of this machining center is the weakest.The results show that the proposed method is easy to calculate,operate,and has strong applicability,the results conform to the objective facts of machine tools,and the proposed method is reasonable and effective.