Abstract: The paper reported a new protein system of feed for dairy cattle. According to the physiological lactation periods,i. e. the lactation, the middle lactation and the later lactation period, a set of concentrated compound feed and additive (recipe A,B,C)was selected to feed the cattle, compared with that fed on the normal food. The results showed the mean milk pield, the milk fat and the mean lactoprotein content of the cattle fed in the recipe A were 5661kg/305days,3. 56% and 3. 22% respectively , 27.7%,0.37% and 0.17% more than that fed on the normal food respectively.