Solid-state NMR measurements at 30T have been performed with a hybrid magnet of National Institute for Materials Science. Spectral resolution less than 3 ppm was confirmed by Br-79 magic-angle-spinning (MAS)NMR measurements of a reference material KBr. A small sample and an aluminum metal shield were used to reduce the effects of field inhomogeneity and fluctuation. As an example of application for an industrial material, Al-27 MAS NMR of a refractory mortar was demonstrated.