According　to　the　formulas　and　program　of　the　deflection　theory　of　self-anchored　suspension　bridges,　the　effects　of　rise-span　ratio,　side　to　center　span　ratio,　girder　stiffness,　as　well　as　if　there　is　outside　stretching　span　and　the　length　of　it,　on　the　internal　force　and　the　deformation　and　horizontal　tension　of　the　main　cable,　are　studied.　Results　show　that　larger　rise-span　ratio　will　decrease　the　axial　force　of　girders　due　to　live　load,　and　increase　the　structural　stiffness.　The　influence　of　rise-span　ratio　to　the　mechanical　performance　of　self-anchored　suspension　bridges　is　explained　analytically.　The　results　show　that　structural　stiffness　will　be　decreased　with　increasing　side　to　center　span　ratio.　Conclusion　is　also　given　with　regard　to　outside　stretching　span　and　structural　stiffness.　The　static　properties　of　self-anchored　suspension　bridge　are　summarized　comprehensively.