[Objective] To improve the overall effect of prevention and control of common diseases of dairy cows in large-scale farms. [Method] 3 856 China Holstein from 22 large-scale farms in Linyi City were randomly selected to investigate and analyze the types,distribution characteristics and causes of common diseases in 2023. [Result] A total of 1 438 sick cows were found,with an incidence rate of 37.3%.There are 32 kinds of common diseases,among which the incidence of obstetric diseases is the highest（13.2%）.Among all common diseases,the incidence of clinical mastitis is the highest（9.2%）.The incidence of adult cows is the highest（28.9%）among the three stages of cows：calves,young cows and adult cows. [Conclusion] It is necessary to improve the health level and milk production performance of dairy cows in large-scale farms by analyzing the causes of the disease and formulating comprehensive prevention and control measures suitable for this field to improve the diagnosis and treatment effect.

cow  /  large-scale farm  /  common disease  /  investigation  /  analysis