A　finite　element　three-dimension　space　model　is　built　by　ANSYS　based　on　the　first　multi-tower　self-anchored　suspension　bridge　in　China.　After　that,　the　work　aims　at　developing　finite　element　analysis　using　backward　and　forward　methods,　discussing　internal　force　of　main　bridge　components　in　different　construction　stages.　Then,　linear　change　law　of　the　main　cable　in　different　load　conditions　is　analysed,　and　mechanism　behaviour　of　this　new　structure　in　the　whole　construction　is　acquainted.　Therefore,　the　work　provides　key　force　analysis　for　multi-tower　self-anchored　suspension　bridge,　making　a　good　example　for　design　and　construction　of　similar　bridges.