A flame retardant containing nitrogen-phosphor for textile was synthesized from phosphorus trichloride, absolute ethylalcohol, carbon tetrachloride, monoethanol amine, methacryloyl chloride. The structure was characterized by 1H NMR，13C NMR, 31P NMR and IR. The result showed that 17.2g Diethyl chlorophosphate (0.1mol), 6.1g Ethanolamine(0.1mol) and 9.05g Methacryloyl chloride(0.1mol) reacted by dropping,then reacted 12h at room temperature， with Triethylamine as Acid-binding agent and Dichloromethane as solution, and the yield coefficient was 69% under the Vacuum distillation of 135℃/0.1mmHg. The diffient condition of emulsion was researched. After the grain diameter of latex emulsion and its stability were tested，it showed that the minimum diameter of emulsion forms in HLB9, and the average of diameter is 123.5nm, the Zeta is +30.193mv.