Abstract: The salt tolerance ability of 7 Italian ryegrass (Lolium multiflourum) varieties (Wasehope, WasehopeⅢ, Sachiaoba, Musashi, Nioudachi, Shiwasuaoba, and Sumu No.1) and the correlation of their salt tolerance ability with the grass feed quality were investigated. The Na⁺, K⁺ and Ca²⁺ contents in aerial parts and underground parts of the plants, and the ratios of K⁺/Na⁺ and Ca²⁺/Na⁺ were measured at seedling, stem elongation, and heading stages. The seedling emergence rate and the feeding quality related traits such as water-soluble carbohydrate (WSC), crude protein (CP), neutral-detergent fiber (NDF), acid-detergent fiber (ADF) and in vitro organic matter digestibility (IVOMD) in stem elongation and heading periods were determined. Na⁺ content in aerial parts of Nioudachi, Sumu No.1 and Wasehope during different growing periods was lower and K⁺ content and K⁺/Na⁺ ratio were higher than in the other four varieties, showing high salt tolerance ability, compared with WasehopeⅢ which was sensitive to salt. Nioudachi, Sumu No.1 and Wasehope also showed high grass yield and good feeding quality such as high WSC content and IVOMD but low NDF and ADF contents, a finding consistent with the results of salt tolerance ability. In conclusion, the salt tolerance ability of Italian ryegrass was positively correlated with the feeding quality of the grass.