Abstract: Contrast between the carboniferous coral reefs in Southern Guizhou and modern coral reefs in South China Sea was done in view of their formation processes and division of sedimentary facies belts, based on the sedimentary environment and characteristics of coal reef. The results showed that a lot of inhabitants are filled in the coral reefs in Bianping village, such as Fusulinids, clum of encrinite and fragments of brachiopod, while the coral fragments are dominantly filled in the modern coral reefs. The fact reveals that although the two reefs are formed in different ages, they are similar in the distribution of sedimentary facies belts and reef formation process, which closely relates to the reef community's status. Compared with the tetra-coral in Late-Carboniferous, the modern hexacoral is more adaptive to environment, and the formation process of modern coral reefs is more labyrinthian.