Abstract: The influence of salt (0, 200 and 400 mmol/L NaCl; 0, 200 and 400 mmol/L KCl) on growth, ion accumulation, chlorophyll fluorescence and gas exchange in leaves and antioxidant levels was assessed in Suaeda salsa plants from different habitats; intertidal and inland saline. 200 mmol/L NaCl significantly increased shoot fresh weight and dry weight and succulence of S. salsa plants, while 400 mmol/L NaCl and all KCl treatments resulted in reduced growth. The concentrations of Na⁺ and Cl^- were increased by NaCl treatments while the concentration of K⁺ significantly decreased. Similarly KCl treatments resulted in increasing K⁺ and Cl^- concentrations accompanied by a marked reduction in Na⁺ concentration. The 200 mmol/L NaCl treatment had no effect on net photosynthesis, photosynthetic oxygen evolution rate, F_v/F_m and φPSⅡin S. salsa, but KCl treatments resulted in a significant decrease in these traits. In addition, 200 mmol/L NaCl resulted in a significant increase in the SOD activity whereas 400 mmol/L NaCl and all KCl treatments markedly decreased SOD activity. Interestingly, the POD activity in S. salsa was significantly increased by all NaCl and KCl treatments. Shoot fresh weight and dry weight, succulence, net photosynthesis, photosynthetic oxygen evolution rate and ion concentration (Na⁺ and Cl^-) of S. salsa plants from the intertidal zone were lower than that those from an inland saline areas. The salt stress effect of KCl was greater than that of NaCl. Saline stress in S. salsa plants from saline inland habitats was significantly greater than plants from an intertidal zone.