In order to improve the milk yield of dairy cows or prolong the peak time of dairy cows' lactation,some farmers arbitrarily increase the breeding density or blindly pursue the milk yield under the condition of insufficient scientific feeding management concept and technology,which leads to the infection of pathogenic microorganisms or metabolic diseases of dairy cows,resulting in the reduction of dairy cows' lactation and the decline of milk quality. Incidence rate incidence rate of breast inflammation is 33.41%. Breast inflammation is one of the most serious diseases in dairy farming. Rumen food accumulation and ketemia are mainly caused by metabolic disorder caused by improper feeding,which also has a great impact on the lactation performance of dairy cows. This paper summarized the incidence rate,mastitis,ketosis,symptoms and treatment methods of dairy cows during breast feeding, and provided a theoretical reference for healthy and scientific breeding of dairy cows.