The embryo development duration and characteristics of Hexagrammos otakii were studied, with each development stage being taken microphotography. The egg of H. otakii was demersal, telolecithal，spherical with diameter of 1.62～2.32 mm. Incubation temperature had a significant effect on embryonic development of H. otakii. With the increasing incubation temperature in an appropriate range, the incubation duration reduced; The incubation rate increased to the maximum of 79% at 16℃, and then decreased. The deformity rate decreased to the minimum of 6% at 16℃ and then increased. Fertilized eggs hatch in about 20d under the conditions of 16℃, 31 salinity, pH=8.0 and 600～1 000 lx light intensity.