This study was carried out to clarify the larvae and juveniles of egg development and autonomous development of Hemibarbuslongirostris from Korea, and to obtain basic data for species conservation and seed production. The shape of theegg was circular and sticky. The average size of the eggs was 2.01 mm (n=10). At 185 hours after fertilization, more than50% of the total embryos were hatched. The newly hatched larvae had an average total length of 8.10 mm (n=5) and hadegg yolk in the abdomen. At 3 days after hatching, the larvae absorbed all egg yolk was average total length 8.64 mm. Onthe 6 days after hatching, the caudal tip of the notochord started to curve upwards was average total length 10.9 mm. At70 days after hatching, the average total length 37.9 mm. The number of fins was i 8-10 in dorsal fin, iii 7 in the anal fin,and ii 5 in the ventral fin.