||Recently, there are many kinds of certification systems, for example, IC card system and biometric recognition system. However, most of them require imposition of users, as users need some actions in front of certification system. Therefore, we suggest authentic method by walking as method without user’s special action in front of certification system. In this research, we use 3-axis accelerometer which is mounted on mobile phone. We extract feature quantity from user’s walking data and experiment identification of pedestrian from waking action. Then, we examined the possibility of realization of the system.