In　order　to　ensure　the　fast　and　effective　drainage　of　pavement　structure,　a　new　drainage　system　of　pavement　structure　made　up　of　geocomposite　drainage　materials　was　proposed　based　on　unsaturated　seepage　theory,　including　the　hydraulic　transport　layer,　capillary　barrier　layer　and　isolation　layer　from　top　to　bottom.　The　model　test　and　numerical　simulation　analysis　of　new　pavement　drainage　system　were　carried　out　to　investigate　the　drainage　performance　of　new　pavement　drainage　system　under　the　condition　of　rainfall　infiltration.　In　the　model　test,　tensiometers　in　the　base　and　subgrade　monitored　the　suction　change.　An　unsaturated　seepage　numerical　analysis　model　was　established　to　analyse　the　effects　of　thickness,　slope　and　position　of　new　drainage　system　on　the　drainage　performance　of　pavement　structure　by　the　control　variable　method.　The　results　show　that　water　seeping　through　the　pavement　is　drained　away　quickly　and　effectively　by　new　drainage　system.　Base　material　has　always　been　unsaturated　in　the　whole　test　process　and　base　suction　starts　to　rise　ten　minutes　after　the　rain　stops.　The　new　drainage　system　can　prevent　the　water　infiltration　to　subgrade　with　subgrade　suction　keeping　at　the　initial　value.　In　terms　of　the　new　drainage　system,　the　volumetric　water　content　of　the　base　increases　constantly　in　the　rainfall　without　reaching　the　saturation　volume　moisture　content.　After　the　rain　stops,　the　volumetric　water　content　of　the　subgrade　decreases　slightly　while　the　volumetric　water　content　of　subgrade　remains　the　same.　The　construction　of　new　pavement　drainage　systems　between　surface　course　and　base,　base　and　subgrade　respectively　has　advantage　of　controlling　the　suction　and　volumetric　water　content　of　base.The　water　content　of　the　base　material　decreases　and　the　bearing　capacity　of　the　base　increases　to　a　certain　extent　with　the　increase　of　the　thickness　and　slope　of　the　new　drainage　system.　The　results　provide　the　theoretical　basis　for　application　of　the　new　pavement　drainage　system.　©　2017,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.