Abstract：DuetothefactthatthedatawritinganddatatransmissionmodeofcurrentVoyageDataRecorder(VDR)dones’tsupportreal—timedataaccess，andthedatacanonlybereadandtransmittedafterVDRisfullywritten，themethodthatVDRfileissegmentedtostoreandtransmitisproposed．Itstimeperformanceisanalyzedandit