Aim at the problem that the engine maintenance guide which maintenances it as a whole can not meet operation and logistics support requirements of element engine, put forwards a repair level analysis of element engine based on IAHP-GRA. Index system is established with characteristics of element engine, analytic hierarchy process (AHP) is improved with the usage of optimal transfer matrix. And model of repair level analysis is constructed by the application of grey relational analysis method. At last, Example result shows that the method is rationality and scientificity.