Soils　are　assumed　to　be　homogeneous　in　most　designs　of　geosynthetic-reinforced　earth　structures　(GRESs),　thus　ignoring　the　influences　of　the　possible　cohesion　and　cohesion　nonhomogeneity　of　backfills.　However,　the　actual　stability　of　GRESs　is　directly　influenced　by　the　presence　of　cohesion　and　cohesion　nonhomogeneity　of　backfills　along　with　the　three-dimensional　(3D)　character　of　GRESs.　In　the　present　study,　a　chart-based　stability　analysis　of　a　3D　GRES　composed　of　nonhomogeneous　cohesive　backfills　subjected　to　the　seismic　excitation/pore　water　pressure　is　conducted　by　means　of　the　limit　analysis　method.　Work　rates　by　seismic　forces　and　pore　water　pressure　are　calculated　based　on　the　pseudo-static　method　and　the　pore　water　pressure　coefficient,　respectively;　thereafter　the　energy　balance　equation　is　derived　by　equating　the　external　work　rates　of　the　soil　weight　and　seismic　forces/pore　water　pressure　to　the　sum　of　the　work　rate　of　the　geosynthetics　and　internal　energy　dissipation　caused　by　soil　cohesion.　The　analytical　expression　of　the　required　unfactored　reinforcement　strength　is　derived　and　the　optimized　solutions　are　consequently　captured.　A　comparison　is　drawn　to　verify　the　present　study　and　a　parametric　analysis　is　conducted　thereafter　to　investigate　the　effects　of　the　3D　character,　cohesion　nonhomogeneity,　seismic　excitation　and　pore　water　pressure　on　the　stability　of　GRESs.　Finally,　a　set　of　stability　charts　considering　the　3D　effects,　cohesion　nonhomogeneity,　seismic　force　and　pore　water　pressure　on　long-term　stability　is　proposed　for　preliminary　design　purposes.