Middle Permian stratum is well developed in the Zuoshan profile of Susong, Anhui, including Chihsia Formation, Kufeng Formation and Wuxue Formation. Exposure of the formations forms a typical middle Permian profile in the lower Yangtze area. Among them, the Chihsia Formation is composed dominantly of carbonate rocks, with minor cherts and clastic rocks. Nine microfacies have been identified within the Chihsia Formation and can be compared with seven standard microfacies amended by Flügel. The Chihisia Formation deposited mainly in slope environment, followed by platform. And slope facies can be further divided into upper slope and lower slope. The upper slope facies occurs mainly in the middle part of swine limestone member (SLM), which is characterized by the development of calcirudites and dominantly MF3 microfacies. The upper slope facies presents mainly in the upper part of middle limestone member (MLM) and upper limestone member (ULM) and microfacies contains MF3, MF8 and MF9. The lower slope facies are well exposed in the upper and lower silicon member (USM/LSM), and the upper part of MLM, whose major microfacies are MF4 and MF5 and which is characterized by the development of thin bedded cherts or elongated chert nodules. The platform facies occurs mainly in the lower to middle parts of MLM, followed by the lower and upper part of SLM and lower part of ULM, whose microfacies is composed mainly of MF1, followed by MF2, MF6 and MF7，suggesting an open platform setting. The microfacies analysis suggests that the Chihsia Formation developed at the process of transgression, during which four regressions happened. The analysis result of clay minerals shows that the compositions of clay minerals of the carbonate rocks of Chihsia Formation is dominated by illite (average: 61.97%) and kaolinite (average: 27.25%), with minor amount of illite smectite mixed layer (9.43%) and chlorite (1.36%). The ratio of kaolinite/(illite+chlorite) and the relative content of illite shows that the climate of the Chihsia stage changed from cold dry to warm wet overall, with three fluctuations in this period. Meanwhile, the climate during the Chihsia stage was generally warm and wet, and increasing trend of sea level was in response to dissolution time of Late Mesozoic glacier（LPIA）, indicating that paleoclimate change resulted in glacier melting which controlled the fluctuation of the sea level. Change of sedimentary facies reflects that the Chihsia stage had four sea level fluctuations, three of which can better respond to climate change, indicating controlling of climate on sea level fluctuation and sedimentary records. Hence, it can be concluded that climate warming resulted in ice melting and sea level rising, under which the carbonate slope facies was developed, and dry climate and increased icebody resulted in decreasing of weathering idex (WI), under which carbonate platform were developed.