According to the performance characteristics and application requirements of heavyduty engine coolants,the basic liquid,functional additives and complete formulation of the coolant were selected and evaluated by utilizing the fuzzy analytic hierarchy process.With ethylene glycol and propylene glycol as the base fluid,and coupled with a variety of additives,a new heavyduty engine coolant was developed.After physical and chemical analysis and a logistics company car test,it is found the coolant has the characteristics such as good cooling and thermal stability,good performances of anticavitation,antirust,antifoam and antiscaling,a long life of use and storage as well as good stability in composition