Abstract: Many Chinese scholars in geosciences believe that in Early Paleozoic，Yangtse palaeoslab was linked with or not far from Tarim Palaeoslab，based on similarity between palaeobiocoenosis and sedimentary facies. This paper discusses the divergence and convergence of these two slabs and their kinematic features from the "Xinkai tafrogeny" and "Emei tafrogeny" emerged in tectonic evolution history of Paleozoic slabs in China, and sets forth the dynamic mechanism of Y angtse palaeoslab drifting to east from the theory of "Emei mantle plume" . The study suggests that if the judgment of these divergence and drifting to east is acceptable, that Tetys within border of China should be opened first is fimly supported, which is also of big significance in theory of geology to studying global Permian basalt erupting in large scale and simultaneously in some places. In addition, they have much more implications for studying the events of broad biogenic extinction during Late Permian and Early Triassic; for finding out metal deposits of vanadium and titanium magnetite in Altun block and adjacent areas; particularly,for searching for giant oil-gas fields of Lower Paleozoic in Tarim basin.

Key words: Y angtse, palaeoslab, Tarim palaeoslab, Emei tafrogeny, X inkai tafrogeny, Emei mantle plume, deposit forecast