Mathematical　model　is　usually　established　for　optimization　of　cable　tension　by　influence　matrix　method　or　unit　load　method　now,　without　regard　to　mutual　effect　between　adjusted　cable-forces.　Aimed　at　their　shortcomings,　double　influence　matrix　method　for　optimization　of　cable　tension　is　put　forward　and　theoretical　derivation　is　made　in　this　paper.　Minimum　bending　strain　energy　of　arch　ribs　is　considered　as　optimum　object　by　means　of　two　influence　matrixes　in　this　method.　Without　iterative　calculation,　exact　cable　forces　could　be　obtained　using　this　method　immediately.　Finally,　taking　a　deck　type　arch　bridge　with　diagonal　cable　as　an　example,　optimization　calculation　of　cable　tension　is　conducted　separately　using　three　different　kinds　of　method　in　this　paper.　The　research　result　shows　that　double　influence　matrix　method　has　the　characteristic　of　fast　operating　speed　and　high　precision.