Under artificial breeding conditions, the early developmental morphology and growth characteristics of Eleutheronema tetradactylum larvae were preliminarily observed and researched on breeding production. The total length of the newly hatched larvae is 1.3-1.35 mm. Under the conditions of culture water temperature of 30℃ and salinity of 35 psu, the mouth opens on the third day, and the yolk sac is completely absorbed on the third day and can start to eat; 13 dah is the larval stage, 14-36 dah is the juvenile stage, and then the juvenile stage. During the breeding process of larviculture, there are obvious differences in the individual growth rate. Therefore, in the process of larval production, care should be taken to feed palatable food organisms in sufficient quantities to reduce cannibalism among individuals. Four seed production trials were carried out this year. The number of juvenile is about 120,000, 30,000, 12,000 and 80,000, respectively. The estimated breeding rate is 40%, 4.5%, 12% and 31%. The fry produced was tested and analyzed without being infected by iridovirus (Iridovirus, Irido-M, Irido-RG), nervous necrosis virus (NNV), streptococcus (streptococcus, S. agalactiae, S. iniae), Vibrio (vibrio, V. fluvialis, V. harveyi) . The preliminary results of this project show that the key technology of seed production lies in how to cultivate a large scale of high-quality living food and prevent cannibalism and the transport successfully.