It was demonstrated that Ectoine could protect Cu-Zn superoxide dismutase from thermal inactivation.When treated Cu-Zn superoxide dismutase with 0.7 mmol/L Ectoine in which the enzyme was incubated at 50,90,100 ℃ respectively,the thermostability was increased by 25.7%,19.0% and 13.2%,0.5 mmol/L Ectoine could increase thermostability by 26.5% when incubated at 60 ℃,0.3 mmol/L Ectoine could increase thermostability by 22.1% when incubated at 80 ℃,0.1 mmol/L Ectoine could increase thermostability by 28.6% when...