Vagueness of assessment engineers subjective judgment and fuzziness of index property arent considered when building the judgment matrix of tool optimization selection by analytic hierarchy process(AHP).This leads to reduce the credibility and accuracy of tool optimization selection. The constraint factors of tools optimization selection was analyzed and multiobjects tool optimization selection model of a twostage structure was built. The five optimization objects include processing time T、processing quality Q、processing cost C、resources consumption R and environment impact E.The algorithm of solving tool optimization selection hierarchical model was put forward and designed based on fuzzy analytic hierarchy process (FAHP) of triangular fuzzy numbers and grey relational analysis (GRA) method.The traditional algorithm of calculating the weight of triangular fuzzy numbers complementary judgment matrix was optimized. Combined with a case of blade tenon milling tool optimization selection in aviation manufacturing enterprise, the method that is used for tool optimization selection is feasible and effective.