With the high_temperature_pressure technique, the crystalline melt inclusions (MI) in beryl from Xihuashan wolframite-quartz veins were homogenized and quenched into glasses. The glasses were analyzed by electron microprobe for the first time. It is shown that they are composed mainly of SiO2(70.72%) and Al2O3 (13.94%), with minor K2O(2.0%) and extremely low other oxides. Melt inclusions contain a lot of dissolved volatile components (mainly H2O, up to11.5%). The liquid-and gas phase of fluids in melt inclusions was analyzed by laser Raman microspectrometry, and the results indicate that CO2 and H2S contents are relatively low in liquid phase (CO2～7.8%,H2S～4.3%), whereas gas phase consists mainly of reduced gas. The analyses of glasses represent the composition of residual melt at the final stage of crystallization differentiation in the granite-H2O_HF system. Melt inclusions coexisting with primary fluid inclusions in beryl from wolframite-quartz veins suggest that the ore-forming fluids were not only hydrothermal solution but also magmatic-hydrothermal transitional fluids composed of coexistent silicate melt and supercritical fluid, and mineralization began at the magmatic-hydrothermal stage.