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Botryoidal dolomite has great value for petroleum exploration and has dominantly developed in the middle and lower part of Member II in the Sinian Dengying Formation in the Sichuan Basin. By means of analysis of the elemental content, strontium isotope, carbon and oxygen isotope and carbonate clumped isotope on four kinds of diagenetic textures of botryoidal dolomite, the origin of botryoidal dolomite is analyzed and described. It has been concluded that botryoidal dolomite developed from various types of cement in progressively filled cavities which were formed by supergene karstification. Also, this study reveals that it is crucial to find freshwater dissolution zones, buried dissolution zones and hydrothermal activity zones for the reservoir prediction in the Sinian Dengying Formation. Keywords: Botryoidal dolomite, Geochemical characteristics, Diagenesis, Origin, Sinian Dengying Formation, Sichuan Basin