In order to contrast the performance of the multiple turbine inter-stage burners turbofan(MTIBT) engine and the ordinary turbofan engine,we established performance simulators for MTIBT engine,ordinary turbofan engine and supersonic cruise missile respectively.Use these simulators,we computed and analysised the performance of a supersonic cruise missile powered by a MTIBT engine and an ordinary turbofan engine with the same parameters.The result shows that the flight capability of a supersonic cruise missile powered by MTIBT engine is much better than by ordinary turbofan engine along the given flight trajectory.