The porphyrin derivatives have a variety of applications in microanalysis. In this study, we analyzed the electrochemical characteristics of porphyrin using quartz crystal analyzer (QCA) to develope a preliminary novel sensor system that utilize the catalytic functions. In LiCl solution, the redox reaction of porphyrin was safely repeated, and the formed viscoelastic film was verified by the cyclic voltammetry. However, the redox reaction of porphyrin did not occur well in KClO4; the reduction peaks were observed, whereas the oxidation peaks were not. Further, the reduction peaks decreased with cycle, especially considerably at the first step. The frequency also decreased in the reduction zone at the first cycle, and then showed stable hysteresis. These phenomena are observed because the porphrin is strongly adsorbed on the surface of electrode, because when it is reduced in the first reduction step, it is deactivated and increased the resistance. Therefore, no oxidation peak appeared, and the reduction peaks became small.