Abstract: In order to make clear the suitable forage oat varieties and areas for cultivation in three different regions of Ulanqab, the agronomic traits and nutritional quality of 5 forage oat varieties were comprehensively evaluated by the grey correlation degree method in this study, and the influence of region and variety on the quality of forage oat was analyzed. The results showed that the comprehensive traits of Tianyan No. 1 in Xinghe County had the best performance. In Fengzhen and Chayouqianqi Banner, the comprehensive character of Molasses was the best. The fresh grass yield of Molasses in Chayouqianqi Banner reached 39 530.00 kg/hm~2, and the CP content was 12.88%, which were the highest in the three regions. The interaction of regions and varieties had the most significant effects（P＜0.01）on plant height, fresh grass yield, stem-leaf ratio, tiller number, panicle length, DM, Ash, CP, ADF, had a significant effect（P＜0.05）on NDF, and had no significant effect（P＞0.05）on EE content. The results indicated that the suitable planting area of different forage oat varieties was limited, Chayouqianqi Banner was the best region to grow forage oat, Molasses and Tianyan No.1 were suitable for cultivation in Ulanqab.