The　BDS　multipath　delay　error　is　highly　related　to　the　surrounding　monitoring　environment,　which　cannot　be　eliminated　or　mitigated　by　applying　the　double　difference　observation　model.　In　the　actual　monitoring　environment,　due　to　the　complexity　of　the　BDS　constellation,　it　is　difficult　for　existing　algorithms　to　consider　GEO,　IGSO,　MEO　and　other　different　orbital　types　of　satellites　for　real-time　and　efficient　multipath　error　reduction.　Therefore,　we　propose　a　novel　BDS　dual-frequency　multipath　error　reduction　method　for　real　deformation　monitoring　for　BDS　considering　various　satellite　orbit　types.　This　method　extracts　the　single　error　residual　of　each　satellite　based　on　the　assumption　of　＂zero　mean＂　and　divides　the　appropriate　grid　density　of　GEO　and　IGSO/MEO,　respectively,　to　construct　a　dual-frequency　multipath　hemispherical　map　model　suitable　for　BDS　satellites　with　different　orbital　types.　This　method　can　realize　the　multipath　error　elimination　of　the　observed　values　of　different　orbits　and　different　frequencies.　The　results　of　simulation　experiments　and　real　deformation　monitoring　data　demonstrate　that　this　method　can　effectively　eliminate　low-frequency　multipath　delay　errors　in　the　observation　domain　and　coordinate　domain.　After　multipath　correction,　the　precision　of　the　horizontal　coordinates　and　height　coordinates　are　1.7　mm　and　4.6　mm.　The　precision　of　the　horizontal　coordinate　and　height　coordinate　is　increased　by　50%　and　60%,　respectively.　The　fixed　rate　of　ambiguity　increased　by　5-7%.