Ethylene glycol gemini sodium 2-methyl-1-pentyl sulfosuccinate was synthesized through an environmentally-friendly process, which was under normal pressure and in the order of single-esterification, sulfonation and diesterification, using carbonyl solid acid as the catalysis of esterification, without purification and separation to the intermediates. The optimum conditions were studied and concluded as follow, in the single-esterificatino, n(maletic anhydride):n(2-Methyl-1-pentanol)=1.05:1.00, using alkyl sulfonate which was 1% of the amount of maletic anhydride as the catalysis, at 80℃ for 1h, the yield can be 98.88%. For the sulfonation, n(maletic anhydride):n(sodium hydrogen sulfite)=1.00:1.05, at 70℃ for 2.0h, the yield can be 98.71%. In the diesterification, n(maletic anhydride):n(ethylene glycol)=1.00:2.20, w(carbonyl solid acid)=3%, at 180℃ for 3.5h, the yield can be 95.05%. The surface tension and critical micelle concentration of the product were tested as 30.3mN/mol and 1.26?0-4mol/L.