A　dual　reciprocity　method　is　proposed　for　the　analysis　of　fluid　sloshing　in　time　domain.　With　a　known　initial　condition,　by　each　time　step,　the　free　surface　position　is　traced　and　zero-stress　conditions　are　imposed　on　it.　If　time　step　is　small　enough,　the　boundary　conditions　are　considered　almost　on　the　true　moving　boundary.　Further　study　is　to　be　carried　out　to　verify　the　precision　of　this　method.