In Guizhou Province of southern China, there are many marine Permian-Trias-sic continuous sections, in which sediment types are highly varied and fossils are abundant, of which Ostracod, fossils are numerous and perfectly preserved. These Ostracod fossils were taken from Zhenfeng, Zunyi, Qinglong and Anshun of Guizhou, including 28 genera and 70 species (Fig. 1).The Changxingian bears rich Ostracods of various types? this fauna contains 25 genera (Table 2). They are well preserved, and have perfect shell decorations. The main types of the shell decorations are spines and nodules on dorsal margins. The Early Triassic Ostracods are scarce and poorly preserved; this fauna contains 8 genera. The shells are smooth or have micro-ornamentations.The changes of the Ostracod abundance and morphology have revealed that Ostracods had a major faunal change near the Permian-Triassic boundary, which provides reliable biological evidence for the determination of the Permian-Triassic boundray in China.