Abstract: Abstract：Based on the biostratigraphic study of graptolites near the Lower/Middle Ordovician boundary, the authors selected five typical stratigraphic section in such Ordovician sedimentary facies of South China as platform facies, basin facies and the transitional facies between the above two facies to conduct graphic correlation of the graptolite faunae near the Lower/Middle Ordovician boundary. The results shed further light on the duration of graptolite faunae near the Lower/Middle Ordovician boundary in South China and the precise correlation of graptolite faunae in different facies, thus laying a foundation for the precise stratigraphic correlation of different facies.