For　the　first　time,　we　experimentally　study　the　phase　control　of　the　coexisting　dressed　probe　signal,　six-wave　mixing　and　fluorescence　signals　in　a　five-level　K-type　atomic　system　by　adjusting　the　angle　between　the　probe　signal　and　certain　coupling　beams.　Such　phase　controlling　results　in　a　switch　between　bright　and　dark　states.　In　addition,　by　using　different　hyperfine　levels　of　the　K-type　atomic　system　as　the　ground　state,　the　magnitude　of　the　dressing　effect　is　manipulated.　The　mechanisms　of　the　three　types　of　nonlinear　processes　are　investigated　by　changing　the　frequency　detuning　and　powers　of　the　coupling　laser　beams.　In　addition,　we　study　the　interference　and　competition　among　the　involved　beams　in　nonlinear　optical　processes.　Such　controllable　nonlinear　processes　could　have　potential　applications　in　optical　communication　and　quantum　information　processing.