A　deployable　structure　can　change　its　shape　according　to　the　need　of　working　states,　which　always　gives　it　the　advantages　of　a　large　expansion/packing　ratio,　easy　transportation　and　storage.　Therefore,　such　structures　have　great　application　prospects　in　aerospace,　civil　engineering,　and　the　military.,　The　structural　deployable　structure　constructed　with　spatial　overconstrained　linkages　is　easy　to　manipulate　and　is　reusable.　It　is　an　important　direction　for　the　development　of　deployable　structures.　In　this　paper,　a　novel　general　twofold-symmetric　Bricard　6R　linkage　is　proposed.　This　linkage　can　be　used　as　potential　basic　elements　of　structural　deployable　structures　due　to　the　twofold　symmetry.　To　facilitate　further　application,　the　general　kinematics　of　this　linkage　will　be　derived　in　this　paper.　First,　the　closure　equations　are　established　by　the　D--H　method,　and　the　general　kinematics　solutions　of　the　general　twofold-symmetric　Bricard　6R　mechanism　are　derived.　The　bifurcation　position　is　determined　by　subsequently　combining　equations　of　the　two　motion　paths.　Then,　the　configuration　condition　and　motion　law　of　the　spherical　4R　linkage　mode　are　given.　Finally,　a　linkage　with　α=3π/2,　γ=π/2,　a=15,　and　r=5　is　analyzed,　and　the　matching　of　the　physical　prototype　and　motion　paths　verifies　the　validity　of　the　kine-matic　solutions.　©　2021,　Editorial　Board　of　Journal　of　Tianjin　University(Science　and　Technology).　All　right　reserved.