At (30+0.2) ℃, the effect of inorganic salt, NaCl,CaCl2 and MgCl2 on solubility，cmc (Critical Micelle Concentration) and the interfacial tension of sulfonate Gemini surfactant DJ aqueous solution was investigated by the methods of direct observation, surface tension and the rotating droplets. The results showed that sulfonate Gemini surfactant DJ had highly resistance to salt while solubility was up to 20000mg /L. As the concentration of inorganic salt increased, the value of cmc and surface activity decreased below 500mg/L first, then increased when the concentration reached to 10000mg/L. With the increase of the valence of cation（Na+，Ca2+ and Mg2+）, cmc had a greater decrease and the influence of Ca2+ was more than Mg2+. Interfacial tension first descended and then rose, smoothed at last by adding inorganic salts. The low interfacial tension of sulfonate Gemini surfactant DJ appeared within a salinity range of 100-1000mg/L. The research could provide certain theoretical guidance to select out suitable surfactant for different water quality of oil reservoir.