The Xuebaoding deposit is located in northern Longmen Mountain of Sichuan Province. The deposit lies mainly in the contact marble between Pankou and Pukouling granites. The deposit is characterized not only by the coarse-grained beryl, scheelite, cassiterite and fluorite but also by mineral zones in ore veins. The typical ore veins can be grouped into three parts. In the first part, granite is the main host rock, and beryl, cassiterite, muscovite with diameters less than 1 cm and K-feldspar with diameters up to 20 cm (fd1, fd2 and fd3) can be found. Part Ⅲ is the most important part of the ore veins with coarse-grained fluorite, beryl, scheelite, cassiterite, albite (Ab4 and Ab5), muscovite and apatite up to 20 cm. All the K-feldspar and albite with various kinds of morphology are distributed throughout these veins. EPMA, XRF and ICP-MS were employed to examine the chemical composition of minerals. Tabular beryls in the Xuebaoding deposit are rich in Li, Rb, Cs, belonging to a type of beryl between Na-Li and Li-Cs beryls. Scheelites are rich in REE+Y (>350×10^-6). Muscovite is enriched in Li, Rb, Cs, suggesting a kind of Li-bearing muscovite. Apatite is a type of F-bearing fluorapatite. F-feldspar and albite are very pure with chemical composition of fd1 (Or 95.34~93.96), fd2 (Or 96.28~97.88), fd3 (Or 95.74~98.39), Ab4 (Ab 99.19~100) and Ab5 (Ab 99.58~100). According to the morphology, and locations, K-feldspar and albite samples were named fd1 to fd5 separately: fd1, fd2 and fd3, Ab4 (in marble host rock) and Ab5 (in marble host rock Li, Rb, Cs, W, Sn, Be were highly concentrated in the hydrothermal fluids during the late stage of the evolution and crystallization differentiation as various types of complex such as SnF2 from the melt. With the increasing temperatures of emplaced magma, the reduced volume of magma after its emplacement led to the formation of fissures in marbles, which also resulted in the fluid immiscibility. Fluid immiscibility might have been induced by the pressure released by extension joints, thereby facilitating the mineralization found in Part III. To constrain the formation age of Xuebaoding deposit, the author selected muscovite with coarse-grained beryl from Part III for Ar-Ar dating and obtained the age of 195.7±2.5 Ma.