Abstract:The response characteristics of forage rapeseed under Na2CO3 stress were studied. The variation characteristics of biomass, K+, Na+ transport, osmotic regulatory substances and protective enzyme activities of rapeseed under Na2CO3 stress were analyzed by setting the concentration gradients of 50, 80, 150 mmol/L of Na2CO3.The results showed that: With the increase of Na2CO3 concentration, the biomass of rapeseed decreased gradually. Na+ in roots and leaves increased gradually with the increase of Na2CO3 concentration, while K+ in stems decreased gradually with the increase of Na2CO3 concentration. Under the stress of Na2CO3, feeding rapeseed could balance the damage caused by malondialdehyde and proline to its membrane system by increasing the content of betaine, and meanwhile reduce the amount of reactive oxygen to maintain the stability of protective enzyme system.