For issues that it is hard to evaluate the effect of frequency hopping communication jamming equipment only using mathematic methods,while the key point of frequency hopping synchronization is not taken into account in the simulation of a general frequency hopping system,a model of full frequency hopping system with synchronization is established by using Matlab/Simulink,and its synchronization process simulated in this paper,based on which,for the concerned frequency hopping jamming equipment,three typical modes of jamming on frequency hopping communication systems are simulated and the jamming performance on various modes of jamming on the frequency hopping communication systems are obtained,offering a more effective way for evaluating accurately the jamming effect of electronic communication countermeasure equipment.