Traumatocrinus hsui is an indispensable part of Guanling Biota. Traumatocrinus hsui with various sizes from the black—dark gray argillaceous limestone of the Wayao Member of the Upper Triassic Falang Formation in Guanling County (South China, Guizhou Province) were discovered, indicating changes of characters in Traumatocrinus hsui from different periods.Methods: Morphological observation and quantitative morphological analysis were conducted in the ontogeny of Traumatocrinus hsui. Different forms of Traumatocrinus hsui were observed and compared in morphological observation, and traditional morphometry was performed in quantitative morphological analysis, in which scatterplot linear regression analysis was principally applied.Results: With crown height increasing, the ratio of cup height to crown height continuously decreased and finally stabilized. Each third- grade arm branches into about 30 fourth- grade arms, some of which even branch to eighth- grade arms. The proximal columns grades increasingly and 4 grades was counted at most. Conclusions: (1) There are three ontogenetic stages during the ontogeny of Traumatocrinus hsui including infancy, juvenile, and adult. Infancy can be divided into two stages: Ⅰ and Ⅱ and juvenile can be divided into three stages: Ⅰ, Ⅱ, and Ⅲ. (2) Traumatocrinus hsui enormis Mu, 1949, Traumatocrinus kueichouensis Mu, 1949, Traumatocrinus uniformis Mu, 1949, Traumatocrinus sp. Mu, 1949, Traumatocrinus guanlingensis Yu et al., 2000 and Traumatocrinus xinpuensis Wanget al., 2002 all should be treated as synonyms for Traumatocrinus hsui Mu, 1949.