Abstract: The effects of different concentrations of NaCl, KCl, MgSO₄ and their mixture on free proline, SOD, POD activity of two kinds of turf grasses were studied.The results showed that the content of free proline waved under different salts and concentrations.That the maximum appeared at higher concentration inferred that the accumulation of prolinewas dominant with the increase of salt stress in some extend;The maximum of SOD appeared at lower concentration while the minimum hasn't the characteristic and the difference of SOD activity in L.perenne and F.elata is insignificant under different salt stress;POD activity waved with the salt concentration increased and its maximum appeared at lower concentration under different treatments except KCl (in L.perenne)and MgSO₄ (in F.elata).POD activity in L.perenne concentrated on higher concentration, however that of F.elata concentrated on lower concentration.Stressed under higher concentration, POD in F.elata was kept at a stable level that is higher than CK and every data approach, but there isn't the result inL.perenne

Key words: Lolium perenne L., Festuca elata Keng., salt stress, superoxide dismutase, peroxidase, free proline