In order to investigate the application of the fuzzy comprehensive evaluation model in the modification evaluation of high energy nitramine gun propellant， the triamino trinitrobenzene （TATB） coated and polyester （NA） coated gun propellant were prepared by coating technology using TATB and NA as the burning rate reduction materials， and their bulk densities， burning rates， explosion heats， propellant burning progressivities and interior ballistic performances were compared. Moreover， the analytic hierarchy process （AHP） was adopted to quantify the influence of TATB and NA on the basic characteristics and the combustion performances above. It was found that， the fuzzy comprehensive evaluation can be established between the basic characteristics and combustion performances of propellants. For the better overall combustion performance， the weight of burning rate is equal to 0.82， which is the highest； the weights of explosion heat and bulk density are equal to 0.11 and 0.07， respectively. In the case of small difference in bulk density， even though the energy loss caused by NA coating is greater than that of TATB coating， the decrease of burning rate by NA coating would be larger and the propellant coated with NA has the better performance than the propellant coated with TATB， and the two are significantly better than that of blank propellant