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DOPO can be used for flame retardant of a variety of polymer materials, such as linear polyester, epoxy resin, bismaleimide, etc., and is widely used for flame retardant of electronics, synthetic fibers, semiconductor packaging materials, etc. At the same time, DOPO and its derivatives can also be used for chemical modification of polymer materials due to their special functions. In addition, DOPO can also be used as insecticides, bactericide, curing agents, antioxidants, stabilizers, photoinitiators, binders, blocking agents for harmful metal ions, lightening agents for organics, and ultraviolet light absorbers.