1,4-butanediol Gemini Sodium lauryl polyoxyethene(3) iso-octyl sulfosuccinate was synthesized under normal pressure by using carbon-based solid acid as the catalyst in esterification，an environmentally friendly process where purification and separation of the intermediates and organic solvents in reaction esterification is unnecessary. The optimum reaction conditions were as follows: For the single esterification ， n (maleic anhydride) : n (1, 4 - butanediol) = 2.15:1.00, and reacted at 110℃ for 2.0h with the yield of 99.23%.For the diesterificationⅠ: n (maleic anhydride) : n (lauryl polyoxyethene(3)) = 1.00:0.55, ω (carbonyl solid acid) = 1%(with the quality of maleic anhydride calculated), and reacted at 170℃ for 2.0h. For the diesterification Ⅱ: n (maleic anhydride) : n (iso-octanol) = 1.00:0.60, and reacted at 220℃ for 4.5h with the yield of 94.36%. For the sulfonation reaction: n (maleic anhydride) : n (sodium hydrogen sulfite) = 1.00:1.05, and reacted at 140℃ for 5.5h with the target product. The structure of product was characterized by IR spectrum and GC/MS, the surface properties and application properties were measured, and it was compared with sodium lauryl polyoxyethene(3) isoctyl sulfosuccinate (AEOSS3) and 1, 4 - butanediol Gemini sodium diisooctyl sulfosuccinate(GSS462).The results showed that the critical micelle concentration of GSS4AEO3-62 reduced one to two orders of magnitude than AEOSS3 and GSS462 and the toxicity were also low.