Abstract: This paper studied the optimal technology of synthesizing the Gemini phosphate surfactant.The intermediate decyl-glycidol ether(I) of Gemini phosphate surfactant was synthesized with decanol and epichlorohydrin in the presence of phase-transfer catalyst;the intermediate decyl digomeric glycol(II) of Gemini phosphate surfactant was prepared by opening ring reaction of decyl glycide ether and glycol in the presence of potassium as catalyst;and the influence of type and dosage of phase-transfer catalysts was studied.The Gemini phosphate surfactant was synthesized with decyl digomeric glycol and phosphatizing agent P_2O_5 by phosphatizing.The influences of the ratio of reactants,temperature and time on the reaction were studied.Benzyl triethyl ammonium bromine was used as catalysis,the quantity of catalyst was 4%,the proportion of the materiel was 2∶1,the reaction temperature was 60℃,the reaction time was 6h,and the final yielding was 78.3%.