It is shown that tidal flat facies and shelf facies sedimentary systems develop in Upper Carboniferous Huanglong Formation in Sichuan Basin. The tidal flat system commonly consists of carbonate tidal flat facies and the shelf facies mainly of periphery-limited gulf shelf facies. On the basic of analyzing sedimentary facies marks and single wells, the researched Huanglong strata are divided into four subfacies and ten microfacies and the Huanglong Member-1, Member-2 and Member-3 maps of sedimentary micro-facies plane-distribution are compiled. It is indicated that the most favorable microfacies for prospective are intertide flat shallow shoal, intertidal algae sand flat, subtidal flat shoal and offshore shallow shoal sediments.