The　polarization　and　threshold　of　distributed　feedback　(DFB)　polymer　lasers　were　controlled　by　adjusting　the　cavity　coupling.　The　cavity　of　DFB　polymer　lasers　consisted　of　two　gratings,　which　was　fabricated　by　a　two-beam　multi-exposure　holographic　technique.　The　coupling　strength　of　the　cavity　modes　was　tuned　by　changing　the　angle　between　the　two　gratings.　The　threshold　of　the　polymer　lasers　decreased　with　reducing　the　coupling　strength　of　the　cavity　modes.　A　minimum　threshold　was　observed　at　the　lowest　coupling　strength.　Moreover,　the　azimuthally　polarized　output　of　the　polymer　lasers　was　modified　by　changing　the　cavity　coupling.　These　results　may　provide　additional　perspectives　to　improve　the　performance　of　DFB　polymer　lasers.