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In this paper, a phosphorus-containing epoxy resin is prepared by the ring opening reaction of DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide) and epoxy resin.The melamine, formaldehyde, bisphenol A as raw materials, the MF-BPA (nitrogen-containing bisphenol A-novolac) is prepared and added to phosphorus-containing epoxy resin system.And at the same time the inorganic powder is used to enhance the flame retardant of epoxy resin.