Considering that intuitionistic fuzzy set is an effective tool to deal with many practical problems,this paper proposes a new ranking method of intuitionistic fuzzy numbers and a symmetric intuitionistic fuzzy Aczél-Alsina weighted average operator.As an application,we use the intuitionistic fuzzy multi-attribute decision-making method with incomplete weight information to analyze the failure probability of oil and gas pipelines,rank the failure proba-bility of pipe sections,and identify high-risk pipe sections.The results show that:(1)the failure probability analysis method based on intuitionistic fuzzy set is more accurate for dealing with the index values;(2)the decision-making method with incomplete weight information reduces the subjective randomness and makes the analysis results more realistic.
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