The Radar Electronic Warfare(REW) simulation system based on computers is used to research and evaluate the jamming modes and jamming signals generally. A REW simulation system adopting the software of VC++ and MATLAB was introduced in the study. The barrage jamming and the deception jamming to radar could be realized, and the jamming effect could be evaluated by the simulation system. The structure and the realized method of the simulation system were analyzed, and the key technologies were discussed in detail. Finally, a simulation experiment was performed under the given scene. The simulation results proved the validity and the practicality of the simulation system．