High-temperature NMR (Proton magnetic resonance thermal analysis) was applied to study the fluidity of slightly-caking coals and coking coals. A pseudo component lumping analysis was made analyzing the free induction decays of these coals into three components, i.e., a rigid component, an intermediate compo-nent and a mobile component. The amount of the mobile component correlates the maximum fluidity (MF) obtained by the Gieseler plastmeter between MF=100-3000ddpm. It was found that the characterization using the amount of the mobile component is more useful than that using the maximum fluidity for several coals having small MF(MF<-20). It was also suggested that the intermediate component corresponds to a new component caused by the interaction of the mobile component with the rigid component in coal.