Since polyaniline doped with camphor sulfonic acid exists different interactions with various organic solvents,PANI.HCSA possesses diverse UV Vis spectra in various organic solvent.In this paper, PANI.HCSA in NMP,DMF,DMSO and m cresol has been studied by UV Vis spectrometry.The results shows the polaron band of the PANI.HCSA in NMP markedly shifts to shorter wavelength,while that in m cresol is steady.