Spin　polarized　transport　was　studied　by　employing　non-equilibrium　Green　function　method,　for　a　model　of　quantum　dot　(QD)　embedded　in　a　mesoscopic　Aharonov-Bohm　(AB)　ring　with　magnetic　field　applied　on　QD.　In　comparison　with　the　situation　without　magnetic　field　on　QD,　the　average　spin　occupations　separate　with　the　increase　in　applied　magnetic　field　on　QD;　in　addition,　magnetic　field　on　QD　has　profound　effect　on　the　density　of　states　for　different　spins　in　QD;　on　the　other　hand,　the　amplitude　and　phase　of　transmission　for　up　spin　and　down　spin　were　found　to　present　novel　effects,　such　as,　the　additional　peak　in　the　phase　of　transmission.　To　understand　the　spin　transport　in　the　system　of　QD　coupled　to　AB　ring,　the　effects　of　the　two　magnetic　fields　imposed　on　the　QD　and　penetrating　the　AB　ring　should　be　considered.　(c)　2005　Elsevier　B.V.　All　rights　reserved.