Shale gas is one of the most important and realistic unconventional gas resources in the future of China. Strengthening the basic research in such research field has large significance to the theoretical innovation in shale gas hydrocarbon accumulation and the use of Shale gas mining technology and accurate calculation of resources. Therefore, the article took the use of large numbers of first-hand information, such as field outcrops data, drilling cores and logging data, organic geochemical analysis and test results for shales, made a detailed analysis for the characteristic of shale sedimentary micro-facies and gas baring of the Lower Cambrian Qiongzhusi formation in southern Sichuan Basin. Combining the sedimentary facies signs and logging phase, it has clearly pointed out that the muddy deep-water shelf micro-facies is the favorable sedimentary micro-facies for the Quality shaleof Lower Cambrian Qiongzhusi formation in the southern Sichuan basin.