Aimed at the problems existed in the lubricant formulation optimization such as a comprehensive comparison of various indicators and properties,quantifying fuzzy information,balancing community comments and other issues,a multiattribute group decisionmaking optimization model of lubricant formulations was constructed based on the combination of fuzzy set theory and combined weighted arithmetic averaging operator(CWAA operator).Taking the heavy load compressor oil of combustible gas as an example,the applicability and rationality of the model was validated.The result shows that the optimization model can elect the better lubricant formulation than others though gathering information of properties and integrating decisionmaker’s opinions effectively.This research provides a scientific and effective decisionmaking method for comprehensive evaluation of lubricant formulation.