Abstract: The carbonate reservoir of lacustrine facies in the western Huimin Sag has the features of thin thickness, great lateral variation and developed cycles. The sedimentology and the sequence stratigraphy principles were used to study the development rules of lacustrine carbonate sedimentary cycles in the first member of Shahejie Formation. The result showed that lacustrine carbonate developed in the littoral-shallow lake, hemi-deep lake and near volcanic cone. The carbonate parasequence in the different sedimentary environment has the different distribution rules, identification symbol and forming mechanism. The development of lacustrine carbonate was influenced by marine transgression, climate change and volcanic activity. The periodicity fluctuation of climate and volcanic eruption of multistage controlled the development of lacustrine carbonate parasequence.