This　paper　investigates　the　problem　of　wireless　power　transmission　in　underground　pipeline　detection　systems.　In　response　to　the　fact　that　during　the　study　of　the　underground　pipeline　detection　system,　the　coil　inductance　value　changes　due　to　environmental　and　anthropogenic　factors,　making　the　system　detuned　and　unable　to　effectively　acquire　the　underground　microtag　ID　signal.　Therefore,　we　raised　a　novel　capacity　compensation　method　to　solve　the　problem　mentioned　above.　Firstly,　the　hardware　structure　of　the　system　is　modelled,　derived　and　analysed　with　the　system　in　a　resonant　state.　The　topology　applied　to　the　system　is　then　subjected　to　capacitive　compensation　operations　to　obtain　the　power　transfer　efficiency　of　the　system　in　the　resonant　state　with　the　best　topology　model.　Finally,　it　is　demonstrated　through　functional　tests　that　the　capacitive　compensation　of　the　optimal　topology　model　achieves　a　good　power　transfer　performance　and　acquires　an　effective　ID　signal.　　©　Published　under　licence　by　IOP　Publishing　Ltd.