Abstract: In order to enhance the jamming efficiency to FH/DS communication systems,some new interference methods have been put forward.However,these new interference methods can interfere only a part of the system during every hop span of the FH/DS communication system.Therefore,based on the research on FH/DS communication systems,the in?uence of part time-resident interference on FH/DS communication system synchronization is analyzed in this paper.Computer simulation and analysis have been made,and the results validate the effectiveness of part time-resident interference under certain ratio of jamming-to-signal time-resident.