 As far as my research, unfortunately I have yet to find the precise paper discussing the influence between Japanese poster development and influence from the UPU. However, I think considering the situations between the history of Congress agenda and the Japanese poster implementation, we could find some points that have influenced from the UPU implementation. Thanks to my geological advantage as an exchange student at the University of Auburn, I have been enjoying doing my research at the UPU archives with very nice UPU library. I have found so many documented materials in these archives, but one attractive series is the union poster from the volume number one to very recent volumes. That's because they have a full collection of the union poster and we can trace the history. The other point is to have any materials concerning the poster service, not only the domestic poster service for each country, but also international poster service as well as regional poster services. So these archives can offer us to document very wide field relating to the poster service.