Abstract: The Permian organic reefs are widely developed in the carbonate areas of South China. Unlike the previous reef-buildng models grounded on the external reef-buildng environmental factors by many researchers,the model presented in this study is employed to study the internal reef-building factors,with the emphasis on biological and ecological characteristics, burial and preservation of the main reef-building organisms such as calcareous sponge and algae,resulting in the presentation of the reef-building model for the Permian sponge reefs in South China. This model is also distinct from the other reef-building models for the organic reefs in geologic records.