Aimed at the optimization of multiindex in the development of greases,the ELECTREI method was introduced into the comparison of the dominance value of the grease formula to obtain the optimum formula of the grease.Taking the development of large gear ring grease for ball mill as an example,after the comprehensive evaluation and analysis of the factors such as evaporability,cold flow property,biodegradability,extreme pressure antiwear property and production cost,the ELECTREI model for formula optimization of grease was established,and the optimal formula optimization scheme was obtained.The optimized model can select the grease formula with good comprehensive performances according to different performance indexes.It is a reasonable and feasible method for selecting the formula of lubricating grease.