| The morphological characteristics were observed and studied in the early life stage of cobia(Rachycentron canadum)，the growth and development characteristics of the embryos, larvae and juvenile were described. The results showed that the fertilized eggs were spherically shaped and buoyant, there was an oil-ball in the central, with an egg diameter of (1.245±0.065) mm and an oil-ball diameter of (0.325±0.027) mm. The fertilized eggs hatched 26 h 30 min after fertilization in the sea water at 27.0±0.5℃, salinity of 29 and pH of 8.3. The embryonic development process was divided into 7 stages, including fertilized egg stage, the cleavage stage, the blastocyst stage, the gastrula stage, the neurula stage, the organogenesis stage and the hatching stage (total 24 developing periods). The total length (TL) of newly hatched larvae was (3.253±0.096) mm, the yolk-sac and oil-ball completely disappeared at 5 days post hatching (dph) and 7 dph respectively, and the larvae completely entered the exogenous nutritional stage. The larvae started to develop to juveniles at 14 dph (TL of 19.933 mm±1.118 mm) when each fin completely formed. At 22 dph, the juvenile with a total length of (41.140±3.779) mm, there were some scales on the caudal peduncle formed. The 46 dph juvenile reached (116.667±5.916) mm in TL, the whole body covered with cycloid scales and their general appearance was similar to the adult fish, except for the shape of caudal fin.