The Nanping granitic pegmatite is one of the most important rare-metal deposits in China. In this pegmatite field the No. 31 granitic pegmatite is the most highly evolved and well mineralized one, where beryl is the most important beryllium mineral. The beryls were studied in this paper by using the electron microprobe analyses and back scattered-electron imaging. The results show that the beryls in this pegmatite can be distinguished into primary beryl and late beryl. The primary beryl crystals were crystallized early from the pegmatitic magma in association with rock forming minerals such as quartz, muscovite, albite and spodumene.