The effects of temperature and pH on stability of the pure enzyme Fe - SOD extracted from Bacillus cereus are explored. The enzyme activity increases slightly when temperature is kept at 25℃ and 35℃ for 20 ~ 95 minutes;the acfivity is 81% and 70% of that of the original when tempelatule is kept at 45℃ for 50 and 80 minutes respectively;it is stable when pH is 6 ~ 10. The results show the advantages of Fe - SOD from Bacillus cereus over that from other microorganisms as well as the importance of the stabilit...