A　twin-arch　rib　footbridge　constructed　with　innovative　use　of　prestressed　stone　ashlars　is　designed　and　its　static　behavior　is　investigated　by　finite　element　method.　Through　FE　spatial　and　plane　models,　general　deformation　modes,　contact-sliding　behavior　of　the　interface　between　stone　element　and　mortar　layer,　as　well　as　stresses　in　the　stone　arch　ribs　under　crowd　load　are　investigated.　It　is　revealed　that　FE　plane　model　can　accurately　analyze　the　bridge＇s　general　deformation.　Conversely,　from　the　analysis　of　FE　spatial　models,　no　separation　or　sliding　between　stone　element　and　mortar　layer　has　been　found　under　critical　load　cases.　Moreover,　stress　control　in　the　different　materials　is　also　achieved.　Finally,　both　geometry　and　structural　layout　of　the　new-type　structure　are　technologically　feasible.