In　order　to　improve　the　crack　load　and　failure　load　of　the　hinge　joint　junction　surface　and　solve　the　problem　of　the　transverse　force　of　the　voided　slab　bridge,　the　mechanical　performance　of　the　prefabricated　voided　slab　bridge　with　transverse　post-tensioning　(TPT)was　studied.　The　mechanical　mechanism　of　the　hinge　joint　junction　surface　was　analyzed　by　a　local　model　test.　The　full-scale　model　test　was　adopted　to　research　the　overall　mechanical　performance　of　the　voided　slab　bridge.　Based　on　the　mechanical　mechanism　of　the　hinge　joint　junction　surface,　the　upper　and　lower　limits　of　TPT　were　determined,　and　the　design　calculation　formula　of　TPT　was　put　forward.　Test　results　show　that　the　normal　and　tangential　bonding　strengths　of　the　junction　surface　with　TPT　are　1.40-1.45　and　0.50-0.62　MPa,　respectively,　which　are　8.1%-12.5%　and　12.4%-38.3%　higher　than　those　without　TPT,　respectively.　Moreover,　increasing　TPT　can　improve　the　normal　and　tangential　bonding　strengths　of　the　junction　surface.　The　failure　mode　of　the　full-scale　test　model　of　the　voided　slab　bridge　with　TPT　is　the　cracking　failure　of　the　voided　slab,　and　no　hinge　joint　cracking　occurs　during　the　test.　The　application　of　TPT　can　improve　the　transverse　connection　among　slabs,　avoid　the　loss　of　the　transverse　load　transmitting　ability　due　to　the　hinge　joint　junction　surface　damage　and　the　failure　of　the　structure,　and　increase　the　ultimate　load　of　the　voided　slab　bridge.　The　proposed　formula　for　TPT　design　can　effectively　calculate　the　design　value　of　TPT　of　the　voided　slab　bridge.　©　2022　Chang＇an　University.　All　rights　reserved.