This　work　conducts　a　seismic　stability　of　a　three-dimensional　(3D)　geosynthetic-reinforced　slope　in　soils　following　the　linear　and　nonlinear　Mohr-Coulomb　failure　criterion.　Three　categories　of　reinforcement　distribution　patterns　and　four　kinds　of　clays　are　considered.　Within　the　framework　of　limit　analysis　and　the　generalized　tangent　technique,　expressions　of　required　reinforcement　strength　and　the　stability　factor　under　different　distribution　patterns　are　derived　from　the　energy　balance　equations.　Comparisons　are　conducted　to　verify　the　validity　of　new　expressions.　Parametric　analysis　is　conducted　to　explore　the　impacts　of　seismic　force,　soil　strength　nonlinearity,　3D　character　of　slope　and　reinforcement　strength　on　slope　stability.　It　is　found　from　the　results　that　the　downwardly-strong　triangular　(DTD)　distribution　pattern　is　the　most　effective　choice　for　slope　reinforcement,　while　the　upwardly-strong　triangular　(UTD)　pattern　is　the　worst.　One　should　intensify　the　density　of　reinforcement　layers　at　the　bottom　of　the　slope　to　achieve　a　better　slope　stability　condition.　Besides,　soil　strength　nonlinearity　and　seismic　forces　both　have　non-negligible　negative　effects　on　slope　stability.