The Western Pung Co Lake ophiolite belongs to the middle segment of the Bangong—Nujiang suture. It is a good ophiolitic accumulate section occurring in Lake Area, northern Xizang(Tibet). The sequence of fractional crystallization of ophiolitic minerals is chromite→olivine→clinopyroxene→plagioclase. It reflects rocks are abundant in Mg and Fe early while rich in Al and Ca later. The composition of rocks of the Western Pung Co Lake ophiolite is similar to that of the representative ophiolitic accumulative rocks in the world. The distribution of trace and rare earth elements of the rocks are consistent each other, which indicates the same genesis of these rocks. Nb and Ta content of rocks are extremely depletion. REE content is very low. Distribution of REE of rocks are flat type with LREE lightly depletion. Petrology and geochemistry characteristics of the Western Pung Co Lake ophiolite indicate it is Suprasubduction zone type ophiolite and formed in a spreading center of a back arc basin.