Abstract: In order to implement the early diagnosis and timely intervention of pododermatitis and mastitis of dairy cows in dairy farms,a total of 681 dairy cows selected from a dairy farm in Daqing of Heilongjiang Province were subjected to pododermatitis diagnosis by using a newly developed HD camera-based device,and the diagnostic speed and results were compared with the traditional plane mirror reflection method.In addition,a total of 100 dairy cows randomly chosen from the above herd and were subjected to mammary duct terminal scoring by using the new type device,and the relevance and consistency of the diagnostic results between the HD camera-based method and LMT diagnostic method were statistically analyzed in combination with the DHI data of the dairy farm.The results showed that the newly developed device had the advantages of fast image transmission speed,good imaging effect,long standby time,fast and accurate diagnosis,low cost and good convenience in discriminative diagnosis of pododermatitis and rapid diagnosis of mastitis in dairy cows.It could accurately determine the different stages of pododermatitis,and could greatly improve the efficiency and reduce labor intensity during the diagnosis process of pododermatitis and mastitis compared with the traditional diagnostic methods.Furthermore,there was a strong correlation and a good consistency in the mammary duct terminal scoring results between HD camera-based method and LMT diagnostic method.Our results provide a new method for early diagnosis and prevention of pododermatitis and mastitis in dairy farms.