Abstract: The traditional failure mode effect and criticality analysis (FMECA) is often used in product risk analysis of failure mode, which does not involve the technological parameter optimization priority analysis of product manufacturing process, and the unreasonable weight distribution of the severity, probability of occurrence and detective difficulty exists in risk priority number (RPN) analysis. A process optimization priority number (POPN) analysis method is proposed by referring to the RPN method of traditional FMECA, taking the manufacturing process of a precision gear as the research object, in which the current technology level and technology improvement cost are considered. And then the optimization priority levels of all technology parameters are evaluated and sequenced based on the analytic hierarchy process fuzzy comprehensive evaluation method. According to the evaluated results, the improvement projects of important technology parameters are presented to increase the reliability and supportability of precision gear products. Key

Key words: machinofaturetechniqueandequipment, FMECA, POPN, technologicalparameter, manufacturingprocess, APHfuzzycomprehensiveevaluationmethod