Electrochemical behavior of aniline at platinum electrode was studied in acetonitrile. The results are compared with those of carbon paste electrode. Our results show little variation from the carbon paste electrode when the picric acid / picrate are present in the setup while without picric acid / picrate our results are comparable to that of the carbon paste electrode. Mechanism can be diagnosed from number of possibilities by taking the consideration of the slopes -dEp / dlogC and dEp / dlog and dEp / dlogX by comparing the theoretical and experimental values. Results are also compared with the slopes obtained in distilled water and in 9:1 acetonitrile /water, shows great variation.