Abstract: A real-time simulator of a two-spool turbojet is introduced,which is implemented with a parallel-processor/microcomputer system.A PC286 microcomputer is used as the host computer,and four TMS32020 digital signal processors are chosen as processing units of the parallel system.The A/D and D/A boards serve as the interfaces of the hardware-in-the-loop simulation of the engine control system.For the parallel processing,it is necessary to partition the aerothermodynamic model of the two-spool turbojet.The elements of Jacobian matrix of Newton-Raphson′s iterative method are calculated parallelly in the 4 processing units.The whole real-time simulation was carried out under the control of the simulation support software,which guaranteed synchronous operation and communication between different processing units,A/D,D/A,the display,and the storage.The real-time engine simulator has been applied to the hardware-in-the-loop simulation for an engine digital control system.The simulation frame cycle time is 29 6 milliseconds.