At the same time, develop flame retardants that are efficient, non-toxic and have little impact on material properties. This leads to the development of reactive flame retardants and the development of additive flame retardants with better compatibility; the development of flame retardants with synergistic effects, such as phosphorus, nitrogen, and bromine in molecules or intermolecular combinations; the development of flame retardants with A series of flame retardants for different application ranges, etc. These will be the trends and directions of future development