The important morphological characters of different stages of the eggs and larvae from fertilization to about 15 mm in total length have been described, based mainly upon the material obtained by plankton nets and by artificial fertilization made during the spawning seasons of the fish at Taichu-Yang, Chekiang, and near Naochow Island,Kwangtung in 1958 and 1959. It is interesting to note that the diameter of the eggs of the Taichu-Yang specimens (1.19-1.52 mm) is much larger than that of the Naochow specimens (1.09-1.32 mm). Some preliminary experiments on the development of the eggs under different constant temperatures (15℃，18℃, 20℃, 21℃, 23℃ and 25℃) were carried out in May and June 1959 at Taichu-Yang. The results showed that the eggs developed normally between 18-23℃. The eggs and larvae of the Large Yellow Croaker look very similar to those of the Small Yellow Croaker, Pseudosciaena polyactis Bleeker, and of some other sciaenids.Hence, their diagnostic features for distinguishing them have been described, especially the two species mentioned above.