The dispute on the geological setting of early Paleozoic mineralization and the tectonic attribute of Xing 'an Block in the Duobaoshan Cu-Mo gold deposit area restricts the determination of regional prospecting direction.In this paper, a set of metamorphic Andesitic crystalline tuff exposed to the Wulihe in the Duobaoshan area has been studied by means of petrogeochemistry, zircon U-Pb chronology (LA-MC ICP-MS),in order to discuss the tectonic setting of the early Early Paleozoic and the tectonic attribute of Xing 'an Block. Sixty zircons from metamorphic andesitic crystalline tuff were randomly tested by zircon U-Pb (LA-MC-ICP-MS) method, and the weighted average age of 206Pb/238U was 502.6±2.7 Ma （n=57, MSWD=1.4）, indicating that they were formed in the late Miaolingtian of Cambrian. The average SiO2 content of metamorphic Andesitic crystalline tuff is 59.02%, with high Al2O3 (average 16.67%), high MgO (average 4.06%), and medium TiO2 (average 0.75%). Its Rittman index (σ) is 1.81 on average, belonging to the calc-alkaline series volcanic rocks. The rocks also contain high Cr (average 104×10-6), Ni (average 64×10-6) and Sr (average 414×10-6), rich in large ion lithophilic elements Rb, Ba, Th, U, and deficit high field strength elements Nb, P, Ti, formed in the continental margin arc tectonic background.The magma is mainly derived from the melt of the subduction plate and the depleted mantle material of the late Neoproterozoic and early Paleozoic. Based on the results of recent geological survey and the characteristics of regional geological construction, it is considered that a set of volcano-sedimentary structures of late Cambrian Miaoling Epoch with certain scale showing the characteristics of continental marginal arc developed along the Duobaoshan-Arong Banner-Hellerstai in southeastern margin of Xing 'an Block. It is necessary for Tongshan Formation in Duobaoshan area to disintegrate further. After the Erguna Block and Xing 'an Block collided and formed the Erguna-Xing 'an Joint Block in the late Neoproterozoic era, it was a passive continental margin background at least from 570 to 514 Ma and the block was relatively stable. At ~ 516 Ma, the mountain roots were disintegrated and the asthenosphere upwelled to form an intraconcontinental rift. With the accumulation of stress, ~ 503 Ma induced the NW subduction of the Paleo-Asian Ocean branch on the southeast side of the Erkuna-Xing 'an Combined Block, thus forming a marginal magmatic arc. Since then, the "Xingan block" has been gradually destroyed and changed into the Paleozoic arc-Basin system, which controls the regional Cu-Mo Au metallogenic geological background.