Abstract：Polyaniline doped with dodecylbenzenesulfonic acid (DBSA) and citric acid was prepared and characterized by CV, thermogravimetric analysis and FT-IR. The conductivity, solubility and electrochromism of polyaniline were studied. The results show that when the molar ratio of DBSA to citric acid is 1:1，the conductivity reach maximum, which is 6.67 S.cm-1. When the molar ratio of DBSA to citric acid is 0.25:1, the solubility of polyaniline in dimethylbenzene is 1.4758 g and can realize uniform electrochromism at -1.5～1.5 V voltages. The electrochromic range is yellow-yellow green-green-blue-deep blue with short response time and the change is reversible.