Calf diarrhea is a common digestive tract disease which is mainly caused by diarrhea,dehydration,electrolyte disturbance and acidosis. It is a common disease in calf farms. The incidence rate of calf diarrhea is high,which seriously affects the growth and survival of calves. Clinically,we should pay attention to the analysis of etiology,adopt the combination of traditional Chinese and Western medicine,suit the medicine to the case,and treat scientifically,so as to achieve good results.