The　actions　of　wind　and　wave　have　a　great　influence　on　the　ship　rolling　motion,　which　may　cause　chaotic　situation　even　capsizing.　Stochastic　bifurcation　and　chaos　for　a　class　of　ships　rolling　motion　in　longitudinal　waves　under　non-smooth　perturbation　and　random　excitation,　i.e.,　the　effects　of　wind　and　wave,　is　studied　by　analytical　and　numerical　methods.　The　stationary　probability　density　function　(SPDF)　for　rolling　motion　is　obtained　through　the　stochastic　averaging　method　as　well　as　stochastic　phenomenological　(P)　bifurcation　is　analysed　by　the　qualitative　change　of　it.　The　parameter　conditions　for　chaos　are　strictly　derived　through　Melnikov　method　and　random　Melnikov　method,　respectively.　Chaotic　regions　and　characteristics　of　systems　parameters　are　illustrated　and　discussed　in　detail.　In　addition,　taking　the　maritime　patrol　ship　as　an　example,　the　analytical　results　as　well　as　the　effects　of　parameter　excitation　and　noise　on　chaos　are　verified　and　analysed　by　relevant　numerical　simulations.　These　results　demonstrate　that　changing　parameter　excitation　amplitude　or　noise　intensity　can　induce　or　suppress　chaos.