Density　functional　theory　(DFT)　calculations　are　performed　to　investigate　the　electronic　structure　and　ferromagnetism　of　(In,　Cr)2O　3.　The　densities　of　states　suggest　that　the　Cr　dopants　provide　nearly　100%　polarization　of　the　conduction　carriers　and　the　ferromagnetic　ground　state　in　Cr-doped　In203　can　be　explained　from　p-d　hybridization　mechanism.　The　calculation　results　also　show　that　the　ferromagnetism　is　strengthened　in　the　presence　of　oxygen　vacancy.