Abstract: 【OBJECTIVE】The resistance enzymes activity,MDA and dissoluvable protein contents effects of different degree salt-stressed on sweet sorghum seedlings was discussed in the paper. 【METHOD】Sweet sorghum seedlings were cultrued in the water, we seted up three salt degrees,and one CK.【RESULTS】Above 50 mmol•L-1 NaCl resulted in membrane lipid per-oxidation, and membrane system is destroys,the action of POD,SOD,CAT and APX declined.Enzyme action of 200 mmol•L-1 NaCl treatments has the largest descendence.100mmol•L-1NaCl treatments are less than 200 mmol•L-1 NaCl treatments. 【CONCLUSION】In the light salt-stressed(when NaCl concentration was 50 mmol•L-1 ),active oxygen did not destroy the membrane system,as a result of resistance enzymes.By the incressing of salt concentration, resistance enzymes activity declined, active oxygen content arised,and the destroy degree of membrane system incressed too.