The Permian in the DianQianGui Basin and its adjacent areas can be divided into three series,the Chuanshanian, the Yangxinian and the Lepingian SeriesTwo obvious unconformity surfaces, one resulting from the main episode of the QianGui structural movement at the turn from Chuanshanian Epoch to Yangxinian Epoch, and another resulting from the main episode of Dongwu structural movement at theturn from Yangxinian Epoch to Lepingian Epoch, not only become the evidentsequence boundaries of type I but also represent the important changing surfaces of palaeogeographical patterns and the characters of the sedimentary basinin the study areaThe Permian System in the DianQianＧui Basin and its adjacent areas is marked by the clear sedimentary facies differentiationThe development of coalbearing strata on the attached platform as well as the formation ofsponge reefs and grain banks in the margin of attached platform and on the isolated platforms led to a particular palaeogeographical pattern thatis characterized by “platformbasinhilltrough”.Concomitantwith the firstepisode of the Dongwu structural movement,a strong volcanic eruption occurredin the northwestern part of the study area, which led to the formation of the widely distributed “Emeishan Basalt”.At the same time,the “QinzhouFangcheng relict trough" was closedThese important events resulted in the great changes of the palaeogeographical patternsThe typical drowning event of the carbonate platforms at the turn from the Permian to the Triassic formed a typical drowned unconformityAccording to the regularities represented by the evolution succession of sediments as well as the distribution patterns of sedimentary facies, the Permian in the study area could be divided into several thirdorder sequencesThe top part of the Carboniferous and the Chuanshanian Series of the Permian form one sequence(SQ¹⁹),the Yangxinian Series includes four sequences  from SQ²⁰ to SQ²³, and the Lepingian Series could be divided into two sequences including SQ²⁴and SQ²⁵Ultimately,the complex but regular facieschanges in time and in space can be clearly illustrated by the palaeogeographical maps as well as the panel diagrams of sequence stratigraphic frameworksFirst, the main temporal facieschanging surfaces marked by the abrupt changes of sedimentary facies and the stratigraphic hiatus form the sequence boundariesDue to the different duration of stratigraphic hiatus at different locations,the diachrononism sequence boundaries of “punctuated surfaces" are formedSecond, the spatial changes of sedimentary environment as well as the migration of sedimentary facies during the temporal changing process always result in the spatial changing surfaces of sedimentary facies marking the obliqueness with chronostratigraphic surfaces and in the end the diachronism of “facieschanging surfaces" is formedThird, various faciessuccession fabric of sequences is formed in different depositional periods, and is regularly changed in space, which means different palaeogeographical backgroundsTherefore, it could be concluded that the regularity represented by “the evolutionary succession of sediments and the distributional pattern of sedimentary facies" is the key factor on the study of sequence stratigraphyOn the basis of biostratigraphic materials, this kind of regularity could be used as an indicator in the division and correlation of strata