Hybrid　Arch　Bridge　of　Steel　Tube　and　Concrete　Filled　Steel　Tube　is　a　new　type　of　bridge　which　evolved　based　on　the　development　of　CFST　arch　bridge.　In　this　type　of　bridge,　concrete　is　only　filled　in　the　tube　of　spring　but　not　in　the　crown　of　arch　rib　which　will　be　benefit　to　decrease　the　self-weight　and　the　position　of　barycenter.　It　is　help　to　reduce　the　reaction　of　lateral　earth　shock　and　enhance　the　lateral　stability.　The　problem　that　the　concrete　in　crown　of　rib　is　not　close-grained　is　also　avoided.　Shanqian　bridge　in　Fujian　Province　is　the　first　bridge　designed　by　this　concept.　In　this　paper,　this　bridge　is　took　as　research　target　and　its　lateral　mechanical　Behavior　is　analyzed　with　the　parameter　of　the　length　for　the　concrete　in　tube.　The　conclusions　are　help　for　the　design　of　this　type　of　bridge.