Abstract: The proline content and soluble protein content of Achnatherum splendens under varying levels of alkaline salinity（0,25,50,75,100,125 and 150 mmol/L NaHCO3 and Na2CO3） were determined.The proline content and soluble protein content were significantly higher in leaves and roots of Achnatherum splendens than in thoseofthecontrolundervaryinglevelsof Na2CO3 and NaHCO3 stress（P0.05）.Under the stress of NaHCO3 and Na2CO3 at the same concentration,the proline content and soluble protein content in leaves were significantly higher than those in roots（P0.05）.In addition,Na2CO3 caused a greater damage than NaHCO3.