A band·splitting phenomenon is studied from the viewpoint of the breakdown of the chaos symmetry and the development of the intermittency. The analyses are carried out for two kinds of coarse·grained variables relevant to the symmetry argument and the burst dynamics, mainly by utilizing similarity exponents introduced for analyzing one·dimensional time series. The develop· ment of the intermittency near the band·splitting point is shown to be chan.cterized as the scaling laws for the similarity exponents.