Abstract: The polythiophene film were gathered directly in ionic liquid BFEE by electrochemical deposition. The doping state of turquoise polythiophene film 1# were get at 1.1 V constant potential, then get undoping state of vivid red film 2# by add 0.2V constant voltage at film 1#. Study the electrochemical performance of polythiophene film using cyclic voltammetry (CV) method, the result indicates that the polythiophene film get from ionic liquid BFEE has good electrochemical stability. Test the two different state polythiophene films’ resistivity through the electric transport test system, we get two sets of data of specific conductance corresponds to film 1# and film 2#, they are 44.64 S/cm and 1.33 S/cm. The specific conductance of doping stated film 1# is 33 times higher than undoping stated film 2#. This result in line with the conclusion that doping can improve the conductivity of polymer. And the data shows that this method of polymerize is good for it’s conductivity of the polythiophene film is fine.