Halogen-free flame retardant FR 730 can be combined with a variety of synergistic agents based on customer characteristics, to realize the glass fiber enhanced or non-enhanced polyamide system flame retardant UL94 V-0 (1.6,0.8,0.4mm, etc.) standard. Furthermore, it has very good colorability, good physical properties and excellent electrical characteristics. According to the polymer specifications, processing conditions, glass fiber content and flame retardant level requirements, the amount of flame retardant should be adjusted appropriately, and it is recommended to add 15-20 parts.