Blend flame retardants are a class of flame retardants that are added to the polymer melt or slurry and then mixed to form a flame retardant before the fabric is molded. This kind of flame-retardant polyester yarn has little effect on the performance of the fabric, but the durability is not as good as the copolymer flame-retardant polyester yarn. Such flame retardants can be divided into: organic halogen, organic phosphorus, inorganic flame retardants, organic nitrogen, organic silicon and so on. The copolymer flame retardant means that it is copolymerized with the polymer monomer before the polymer is molded or grafted onto the polymer chain. Such flame retardant mainly for: organic flame retardants, including copolymer halogen flame retardant, copolymer phosphorus flame retardant, copolymer silicone flame retardant and other types of copolymerization. Fabrics are an indispensable part of people's lives, the use of flame-retardant polyester yarn in the future will become an important process of fabric processing. Flame retardant polyester filament used in the curtains played a certain role in fire protection. Curtains are made of fibrous fabric, easy to fire burning, burning fast and easy to flammable other combustibles, so that the fire more difficult to extinguish. With the flame-retardant polyester filament treated curtains with fire-retardant features, to achieve the effectiveness of fire and disaster reduction is widely used. People's Republic of China standard GB50222-95 "Building interior design fire safety regulations" provides decorative materials according to their combustion performance is divided into four: A level of non-flammable; B1 flame retardant; B2 grade flammability; B3 grade flammability. Therefore, only to reach the A-level and B1-level fabric can be called flame-retardant fabric. With the flame-retardant polyester filament treated curtains can also be divided into one-time fire-retardant curtains and permanent fire-retardant curtains two.