Abstract: A flame retardant，10，10'-(5H，5H)-Spirobiphenophosphazinium chloride was prepared，its effects on the flame retardance and mechanical properties of ABS/Al(OH)3 composites were explored via regressive analysis of the data from a uniform design experiments using SPSS software. When the weight ratio of ABS, 10，10'-(5H，5H)-spirobiphcnophosphazinium, and Al(OH)3 in the composite was 100 /22 /18，excellent comprehensive properties were obtained.The notched，non-notched impact strengths, and tensile strength were 9.02KJ/m² 2.80 MPa, respectively. The oxygen index was 26. 1，horizontal firing ranked I，and vertical firing ranked FV-0.

Key words: acrylonitrile-butadiene-styrene copolymer, 10, 10'-(5H, 5H)spirobiphc-nophosphazinium, uniform design, flame retardancy