The　stationary　Navier-Stokes　equations　with　nonlinear　slip　boundary　conditions　are　investigated　in　this　paper.　Because　the　boundary　conditions　include　the　subdifferential　property　on　the　part　boundary,　the　variational　formulation　of　this　problem　is　the　variational　inequality　problem　of　the　second　kind　with　Navier-Stokes　operator.　The　main　purpose　of　the　paper　is　to　study　the　existence　of　the　weak　solution　and　the　strong　solution　to　this　variational　inequality　problem　in　terms　of　the　Yosida＇s　regularity　method.　(C)　2011　Elsevier　Inc.　All　rights　reserved.