In order to understand the salt tolerance of Festuca arundinacea L, Poa pratensis L and Lolium Perenne L, 8 different varieties, Festuca arundinacea L ( ‘ Barlexas ’ , ‘ AridⅢ ’ , ‘ Sunboy ’ ), Poa pratensis L ( ‘ Nassau ’ , ‘ Bluechip ’ , ‘ Merit ’ ) and Lolium Perenne L ( ‘ Prime ’ , ‘ Focus ’ ) had been treated by nutrient solution in different concentration of NaCl. The results showed that: the critical salt concentration of Poa pratensis L was 200 mmol/L, and the critical salt concentration of Festuca arundinacea L ...