On the bases of newly 1∶50,000 regional geological investigation and achievements of 1∶250,000 regional geological reports as well as former studies in Zhongba area, a terrane with strata dominated by the marine Paleozoic Triassic was nominated and classified in this paper, which are narrowly pinched out between the so called two series of mélanges within the western Yarlung Zangbo suture. The Zhongba microterrane, as suggested herein, is defined as a stratigraphical terrane composed of the marine (Sinian /) Ordovician through the Triassic and confined between two faults: Zanda Zhongba Chacang fault in NE, Qonggo Munse fault in SW. Two stratigraphical subzonations of the Muxia and Horba Zhongba can be distinguished by a rough Barga Mayom boundary. In the Muxia subzonation, the Ordovician Triassic is sedimentary and/or slightly metamorphosed with single dip and/or open fold, but in the Horba Zhongba subzonation the pre Carboniferous is mainly medium lowly grade metamorphosed with tight and congruous fold. Four tectonic layers are classified as the Sinian Cambrian, Ordovician Devonian, Carboniferous Permian, and Triassic by nonconformity respectively, approximately representing four periods of sedimentary and tectonic evolution for the microterrane