An important tectonic movement occurred at the turn from the middle to the late Triassic, which has been nominated as the Indochina Movement, was express as the following tectonic events in the South China: ① the formation and the uplift of the Qinling Dabie orogenic belt along the northern margin of the South China, which records the collision with North China Plate; ② the strong action of the 1300 km wide intra continental orogen in the southeastern part of the South China Plate, which led to the shift of the foreland thrust fold zone toward the northwest.The result of these tectonic events led to the death of the long term development history of the Yangzhe platform that formed a stable palaeogeographical element from the Eidacaran to the end of the middle Triassic, and this stable palaeogeographical element is marked by the development of shallow water carbonates over this vast platform during much of this vast of expense of time.After the death of the Yangtze platform, a particular sedimentary basin, i.e.the upper Yangtze foreland basin (or the Sichuan foreland basin) was formed in the late Triassic, in which accumulated the Xujiahe formation that is characteristic of the fluvial deposits and their relative strata.The Xujiahe formation that is characteristic of the fluvial deposits direct covers the shallow water carbonate rocks of the Maantang Formation and the siliclastic rocks from the shelf to the littoral facies of the Xiaotangzi Formation in the western part of the Sichuan Province, and gradually become thinned or even overlapping pinched out toward both the east and the south; ultimately, a special sequence stratigraphic framework of the upper Triassic was formed in the study area, and this sequence stratigraphic framework become an important matter records expressing both the death of the Yangtze platform and the birth of the Upper Yangtze foreland basin.Like the birth of a special foreland basin of the late Triassic in the platform margin of the middle Triassic in the southwestern part of Guizhou Province and a particular basin filling succession of the upper Triassic in this basin, the sequence stratigraphic framework of the upper Triassic in the Upper Yangtze foreland basin, especially for the alluvial architectures that is marked by the particular depositional trends (the sequence is composed of the succession from the high accommodation system tract (HAST) of the coal measure strata to the low accommodation system tract (LAST) of the bottom loading sandstones of the high energy fluvial system) of the fluvial system of the Xujiahe Formation, and its specially spatial distribution that is marked by the thinning or even pinching out toward both the east and the south, not only becomes an important record of both the death in Yangtze platform and the birth of the upper Yangzhe foreland basin but also expresses a particular sequence stratigraphic succession of the fluvial deposits within the filling succession of the foreland basin.