In　order　to　clarify　the　positive　ion　mobility　in　nitrogen　(N2)　containing　tiny　amounts　of　oxygen　(O2),　experimental　measurements　were　carried　out　for　further　analysis.　A　closed　testing　box　including　coaxial　cylindrical　electrodes　with　different　parameters　was　built　up.　Under　the　same　temperature　and　humidity　conditions　inside　the　box,　DC　positive　corona　was　applied　to　produce　the　positive　ions.　The　voltage　and　current　values　were　recorded　with　different　O2　concentration　in　high　purity　N2,　then　the　analytical　calculation　of　positive　ion　mobility　was　carried　out　based　on　the　classic　fluid　model.　The　mobilities　under　different　O2　concentration　were　compared　and　analyzed.　It　is　found　that　all　the　mobilities　of　positive　ions　with　different　electrodes　in　N2　decreases　when　the　O2　concentration　decreases　from　about　2.1%　to　0.9%.　The　results　show　that　the　mobility　of　positive　ions　in　N2　is　increased　with　the　O2　concentration　increased,　so　the　presence　of　dilute　O2　will　accelerate　the　movement　rate　of　positive　ions　in　N2.　The　results　can　provide　a　reference　for　analyzing　the　ion　migration　process　in　N2　containing　dilute　O2,　as　found　in　corona　and　streamer　discharges.　©　2023　IEEE.