The yellowtail kingfish, , is a globally distributed marine economic pelagic fish species. It is a popular table fish all over the world for its tasty flesh and high nutritional content. As the consumption demand has increased and natural resources have declined in recent years, an increasing number of countries including China have begun to artificially culture this species due to its fast growth and market value. It is particularly suitable for the deep sea net cage culture method and is thus a promising candidate for the deep sea farming industry in China. Studying the morphometrics and physiology of embryos, larvae, juveniles, and young fish to obtain information about their early life history is the first step and key to the successful aquaculture of a fish species. Thus, we observed, recorded, and described the morphometric characteristics of the embryonic and postembryonic development of in order to provide basic knowledge for the artificial breeding and seedling production of this species. The fertilized eggs obtained by natural spawning were spherically shaped and buoyant. The fertilized eggs were transparent and had one oil globule in the yolk, with an egg diameter of (1.48±0.04) mm and an oil globule diameter of (0.37±0.02) mm. The fertilized eggs hatched 73 h 40 min after fertilization in (21.5±0.5)℃ water with a salinity of 32 and a pH of 8.0-8.2. The total length (TL) of the newly hatched larva was (4.23±0.39) mm and consisted of a long oval yolk sac, which accounted for one third of the TL. The larvae opened their mouths and exhibited blackened eyes at 3 days after hatching (DAH) with a TL of (4.61±0.43) mm. At this time, the yolk sac decreased in volume by approximately 95%, and the swim bladder primordium formed. Larvae at 4 DAH were (4.57±0.88) mm in TL and began to feed on rotifers, thus entering the mixed feeding stage. Five DAH, the larvae with a TL of (4.68±0.25) mm exhausted the yolk sac and the swim bladder began to inflate with air. The oil globule was absorbed at 8 DAH, and the larvae (TL 5.14 mm±0.358 mm) completely entered the exogenous nutritional stage. The swim bladder of the larvae at 7 DAH (TL of 4.79± 0.36 mm) became a bright vesicle after inflation with air, which exists through their life history. The intestine of the newly hatched larvae was thin, short, and straight, but became long, curled, and complicated with development. The first intestinal physiological curve formed at 10 DAH when the larvae were (5.19±0.37) mm in TL and the second formed at 15 DAH when the larvae reached (5.71±0.50) mm in TL. Flexion of the notochord started at 15 DAH and was completed at 25 DAH when the larvae were (8.66±1.06) mm in TL. The development of the dorsal fin, pectoral fin, anal fin, and caudal fin was completed by the time the juveniles were (20.04±1.56) mm in TL. At 60 DAH (TL 65.06 mm±1.94 mm), the scales on the body surface formed. At 80 DAH, when the young fish achieved (134.05±3.25) mm in TL, their appearance was similar to that of the adults.