Abstract: This article deals with the embryonic stages of the turtle, Chinemys reevesii. On the basis of the changes of outer morphological characters, the temperature of incubation and other factors, twenty-eight stages are divided from egg laying to hatching. Major morphological characters and inner structures of every stage are described respectively. The authors discussion the staging parameters of embryonic development, the forming of gastrulation, "ammon tail fold" and "posterior amnion tube" and the forward movement of the embryo itself.