RICH Chrenkov counter is used for identification of chraged pions in higher than 5.5 GeV/c. The threshold behavior of the real data shown in Fig. 9 are well described by the estimation numbers shown in the solid line.. Note that the contamination of electron is about one tenth of 1 % in this momentum region. And the ring image are shown in the inset of Fig. 9 (note that multiple tracks are accumulated). The identification of pion by RICH has provided inclusive pion spectra from 5.5 GeV/c up to 10 GeV/c in .