Tubiphytes are widespread in reef strata of the Late Carboniferous in South Guizhou Province. They have a variety of morphological forms. The dense Tubiphytes construct the reef rock mainly by binding. They also form the reef with other reef-building organisms in the study area. The Tubiphytes reefs are relative small-size and localized. In the study area, most of Tubiphytes form boundstone. Tubiphytes boundstone can offer a stable substrate of coral reef by binding sediments. They can also bind the bioclastic grains to form a massive boundstone and enhance the stability of coral reefs. As the important component of the carbonate rocks, Tubiphytes also extensively occur in the strata with other bioclasts.