Based on 3-factor orthogonal designed experiment for artificial pasture planting in the arid area of Yanchi Ningxia, height, density and yield of 6 forages were studied in two consecutive years. The results showed that the effect of species on plant height and density was large, while effect of organic manure and NPK on the height and density of same forage species was small. The effect of each factor on perennial fresh yield was species ＞ NPK ＞ organic manure, the influence of these 3 factors on yield was significant（P＜0.01）, interactive effects of organic manure and NPK was significantly（P＜0.05）. The fresh yield of legume species was greater than the forage grass. Melilotus suaveolens has the highest yield, which is better as forage and crop rotation. Followed by Medirago sativa, which can be long term used as excellent forage. The optimal combination of artificial grassland is Melilotus suaveolens. plus 36 tons organic manure per hectare and moderate levels of NPK, i.e., 165 kg of N, 135 kg of P and 135 kg of K per hectare. The level of each factor is consistent with treatment No.15, in which the yield was the highest. This proved that using the orthogonal test is reliable for the establishment of artificial grassland.