【摘要】Carryingoutanadditionalinvestigationtonon-esponseunitsisanimportant meanstosolveomissiondataproblemsinstatisticsinvestigation.Usuallythereex- isttwobasicforms:oneisrepeatinginquiries,theotherisdoingsecondsampling. However,evenadditionalinvestigationisemployed,non-responseproblemsareun- avoidable.Therefore,theadjustmentofdataisoftenneeded.Thepapermainly discussestheproblemsmentionedabove.