It was affected the security and nutritive value of feeds that the contamination of wheat bran and wheat middling .The main content of this paper was to research the prevention and control technology of wheat bran and wheat-middling process. Research the changes of microorganisms of tempered wheat, wheat bran, wheat-middling and wheat flour after used chlorine dioxide or ozonated water instead of the water to tempering, the quality properties of each productions tempered by chlorine dioxide or ozona...