According to the experiences of largemouth bronze gudgeon culture in the boat cages,the disease characteristics and prevention and therapy technologies of fish diseases such as ichthyophthiriasis,furunculosis,trichodina,gyrodactylus,dactylogyrus,saprolegniasis,hepatobiliary syndrome,stress hemorrhagic disease,bothriocephaliasis,red skin disease,putrid skin disease,chilodonella,vorticella and lernaea were summarized here.