Abstract: In order to select forage oat varieties adapted for cultivation in Hinggan Leagu e , forage yields of 25 oat varieties at different phenological stages and cutting stages were compared in a field experiment. The results showed that the phenological periods of oat varieties ranged 70 - 87 d; the fresh yields and hay yields ranged 18.3 - 68.2 t·hm⁻² and 2.9 - 8.0 t·hm⁻² at booting stage, 27.6 - 72.4 t·hm⁻² and 4.8 - 8.1 t·hm⁻² at heading stage, 38.8 -76.2 t·hm⁻² and 6.7 -14.8 t·hm⁻² at flowering stage, 32.4 - 87.0 t·hm⁻² and 7.4 - 22.2 t·hm⁻² at milk ripening stage, respectively. Significant yield differences were found among varieties (P < 0.05). Comprehensive analysis showed that variety Bayou 3 is suitable for hay harvested at booting and heading stages; varieties Yuanza 1 and Bayou 18 are suitable for hay harvested at flowering stage; and varieties Zhangyou 13, Dingyan 2 and GL381 are suitable for hay harvested at milk ripening stage.