Abstract: In order to determine the effects of different altitudes on the yield and quality of silage maize and screen out the suitable varieties for planting in the southern mountainous area of Ningxia, four varieties（Dongdan 60, Tunyu 168, Tieyan 53, and Shiyu 9） were planted at 1 940 m（low elevation Ⅰ）, 2 085 m（middle elevation Ⅱ）, and 2 170 m（high elevation Ⅲ）, respectively. A two-factor randomized block experiment was designed to compare and evaluate the production performance（plant height and fresh weight）, nutritional indexes（crude protein CP and ether extract EE） and relative feeding value（RFV）. The results showed as follows: plant height and fresh weight were different at different altitudes. With the increase of altitude, plant height and fresh grass yield gradually decreased, and the differences were significant（P＜0.05）. CP and EE at the middle elevation were significantly higher than those at other two altitudes（P＜0.05）. The order of RFV from high to low was the high altitude point Ⅲ＞middle altitude point Ⅱ＞ low altitude point Ⅰ. The fresh grass yield, fresh-dry ratio, stem-leaf ratio, stem strength, CP and crude ash content of Tieyan53 were the highest at the three elevations. The results indicated that Tieyan 53 had high stability and was suitable for planting in the mountainous areas with an altitude of 1 940-2 200 m in the southern of Ningxia.