Some greisen bodies occurring in the Xianghuapu district, Linwu County, Hunan Province, are characterized by pegmatitic texture, horizontal zonation, inhomogeneity in texture, structure and mineral assemblage, presence of melt inclusions in topaz and quartz, and enrichment in F, HaO, Li, Rb and K and depletion in Na. According to the occurrence, .textures and structures and fluid-inclusion data for these greisen bodies, the author thinks that they directly crystallized from F, H^O, Li, Rb and K-rich and Na-poor greisenic magma ("esuiite magma") under closed conditions. This conclusion has strongly been supported by the data of experimental petrology of the system granite-H2O-RF (R = Li, Na, K, Rb, Cs and H+). There is no rock similar to these greisen bodies in the known igneous rocks and their altered rocks; therefore they might be regarded as a new type of. magmatic greisen, and named greisen-pegmatite by the author according to their mineral assemblage, texture, structure and origin. The paper introduces briefly the geological and geochemical features of these greisen-pegmatite bodies, makes a suggestion on classification and nomenclature of greisen-pegmatite, and discusses their lithogenetic mechanism.