Monoamido orthophosphate(m-AOP) . synthesized as an intermediate. was converted to biB(3-ch-toro-2-propanol) monoamido orthophosphate [(CP)2-AOP] by addition reaction with epichlorohydrin. Bis(3-chloro-2-lauroylpropyl) monoamido orthophosphate[ (CLP)1-AOP] was synthesized by condensation reaction of the (CP)2-AOP with lauroyl chloride. A water soluble flame retardant, CPF. was prepared by addition of water to the (CP)2-AOP, and emulsion type flame retardant, CLPF, wt% also prepared by addition of three kinds of emulsifiers. As a result of treatments of the flame retardants on various synthetic fibers. CPF showed only good flame retardancy, but CLPF showed both good flame retardancy and good softness.