The Language Atlas of China classifies the Yanzhou dialects as belonging to the Huizhou family. Cao (1996) has studied four Yanzhou dialects (i.e. Chun’an, Suian, Jiande, and Shouchang) and has expressed doubts about the Atlas classification. In the present paper we have found that Chun’an, Suian, and Jiande share common innovations and consequently should be assigned to a common family. Shouchang, on the contrary, lacks these innovations and should therefore be excluded from the grouping. In conclusion we also subscribe to Cao’s doubts regarding the common origin of the Yanzhou and Huizhou dialects.