In this study, the change in frequency of extreme precipitation between previous and recent period in Japan was compared with Clausius-Clapeyron (CC) rate:7%°C-1, in order to check if the change in frequency of extreme precipitation is similar to the CC rate as suggested based on dataset in Europe. In many results, the change in frequency of extreme precipitation was similar to the CC rate:7%°C-1, but also some results showed the change in frequency more than twice as much as the CC rate:14%°C-1.