Abstract: To determine the suitable temperature and salinity for hatching, the embryos of Nibea japonica were hatched at different temperatures and salinities. The result indicates that at salinity of 30, the fertilized eggs can be hatched within 14~28 ℃ and the optimal temperature for hatching is 18~20 ℃. The hatching time (H) and temperature (T) are power function relative. The hatching time shortens with rising temperature. All fertilized eggs of N.japonica hatch within the salinity of 14~45, suspend or semi-suspend within the salinity of 25~32 at 18 ℃, and the suitable salinity for hachting is 26~32. The total length of newly hatched larvae, which in low salinity group is significantly longer than that in high salinity group (P0.05), is significantly affected by salinity.