The effects of saline stress(NaCl,Na₂SO₄,NaHCO₃ and Na₂CO₃) with different contents on the growth and physiological indexes in pot-cultured Rubus crataegifolius seedlings were studied.The results showed that:(1)The growth of R.crataegifolius seedlings was promoted by NaHCO₃ and Na₂CO₃ under lower salinity,and inhibited under higher level.It was inhibited by NaCl and Na₂SO₄ under different salinity.(2)With the saline stress rising,the relative electric conductivity was increased,and the malondiadehyde(MDA) accumulation fluctuated.The changed trend between the two indexes was similar under Na₂SO₄ and NaHCO₃ stress,and it was different under NaCl and Na₂CO₃ stress.(3)The SOD activity increased and then decreased with increasing salinity,while,POD activity decreased then increased,which showed that it mainly depended on the SOD and POD complementary action to reduce oxidative damage.(4)The salt tolerance thresholds for R.crataegifolius seedlings were 85.18(0.50%,W/V),40.77(0.58%,W/V),171.00(1.44%,W/V) and 114.20(1.21%,W/V) mmol·L^-1,when taking 50% drop in relative height growth as the standard.As a consequence,the growth of R.crataegifolius seedlings was restrained under different salinity-alkalinity stress,but they could adjust themselves by increasing the activities of protective enzymes(SOD,POD) to reduce the salt injury under a certain saline conditions,and maintain the normal physiological metabolism of plant seedlings.The R.crataegifolius seedlings tolerance ability to alkaline salt(NaHCO₃ and Na₂CO₃) was stronger than that of neutral salt(NaCl and Na₂SO₄).