Through complete artificial propagation test and embryonic development observation of Coilia nasus, the characteristics of complete artificial propagation, and the morphological and ecological traits at each stage of embryonic development of Coilia nasus were studied. The results show that artificial breeding F₁ Coilia nasus broodstock (two-year-old) was cultured by the simulated natural migration method; Excellent individuals were selected from the sexually mature broodstocks as parent fishes and induced by injected [D-Ala⁶-Pro⁹-Net]-LHRH-a, and the treatment dosages are: 30 μg per Kg for females and half of doses for males; at 22-24 ℃, the broodstock naturally copulated and spawned after 18-33.5 h following the hormonal treatment, the inducing rate was 91.7%; 2.58×10⁵ fertilized eggs were obtained, and the fertilization rate was 80.6%; 2.23×10⁵ yolk-sac larvae were hatched, and the hatching rate was 86.4%. The fertilized eggs were transparent, buoyancy, cohesionless, and spherical in shape with a diameter of (909.86±24.02)μm. The egg had one big oil-ball. According to morphological characteristics, the process of embryo development could be categorized into 7 physiological stages with 30 periods: the blastoderm form stage, the cleavage stage, the blastula stage, the gastrula stage, the neural stage, the organogenesis stage, and the hatching stage. The embryo development lasted for 28 h at the water temperature (23.64±0.36)℃. The newly hatched larvae were transparent and floated on the surface of the water by the oil ball, and the total length was 2 056.37-2 074.74 μm. The yolk sac was nearly elliptic, and the oil ball was spherical. The heart rate was 90-110 per minute, and the muscle section was 48-50 pairs. This study is important in the protection of resources and artificial breeding of Coilia nasus.