In order to meet the requirement of military transport aircraft design scheme, this paper introduces an evaluation method of the military transport aircraft design scheme based on the grey relation projection. Evaluation indexes of military transport design scheme such as the mission capability, the capability of stone's throw rise and fall, availability, survivability, affordability, risk and comfort are analyzed. Then the six military transport aircraft design schemes are evaluated by the grey relation projection method. With this method, a weighed grey relation matrix of each military transport aircraft design scheme is built and the grey correlation projection values of the design schemes comparatively to the perfect scheme are calculated according to the vector projection theory. The grey relation projection values can be used for evaluation of the schemes. The result calculated shows that the grey relation projection method is feasible in application to military transport aircraft design scheme evaluation.