Abstract: Studies on the eggs and embryonic development of Chiloscyllium plagiosum showed that the eggs were big, the egg yolks were oval,with the longer diameter of 25.91-36.16 mm and the short diameter of 13.56-19.44 mm. The eggs covered by brown, leathery with a little malleable, and opaque external shell with the longer diameter of 75.25-107.30 mm, the short diameter of 33.39-47.70 mm and the thickness of 15.82-24.65 mm. Under water temperature of 28.0 ℃ and salinity of 26.2-28.8, the young fish hatched between 65 and 80 d after deposition. The embryonic development of Chiloscyllium plagiosum was divided into 23 stages with suitable names.The toal length of the newly hatched young were 121.82-166.80 mm, while the body mass were 5.30-18.22 g. The yolk remained just a little or nothing at all out of the body, but there were yolk inside the body. They had the figure of the adult fish. There was a significant linear correlation between toal length（L/mm）and incubation time（D/d）：L=2.1368D－11.175（R=0.9862）,while a significant curvy correlation between body mass（M/mg）and the accumulative time（D/d）：M=0.0001D^4.3763（R²=0.9579）. The curve between body mass（M/mg）and toal length（L/mm）was fitted by M=0.0005L^3.4278 (R²=0.9822）.