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In order to overcome the drawback that the traditional risk priority number method could not clearly make a risk priority sequence, a new analysis method of RPN was presented. Combined with loss costs, this method was based on FMEA. Several quantitative parameters such as servicing time and costs were introduced to replace the three parameters used in the traditional method. And it took loss costs caused by failure as the final risk priority number, instead of severity of effects, probability occurrence and difficulty detection. Finally, safety evaluation to work equipment and other critical systems of a forklift was processed as a case to illustrate this proposed method. The results showed that the results processed by the new method could be utilized to solve the problem that the RPN values couldn't be sorted.

Accurate risk prioritizing is directly related to the effectiveness of risk management. To overcome the shortage of the single numerical evaluation value, aiming at improving the accuracy of risk factors, a new risk priority method was proposed based on geometric characteristics of triangular fuzzy number and Analytic Hierarchy Process (AHP). This method was established on the basis of the fuzzy description of risk factors from experts, after the risk evaluation system was established. Then the fuzzy description of risk was processed with AHP, and fuzzy weights of risk factors were obtained and calculated it by using the geometric characteristics of triangular fuzzy number. Finally, the detailed ranking of risk factors by severity, probability and detection of risk was obtained. The risk priority of forklift system was processed to analyze the feasibility of this method.