The hairtails, Trichiurus haumela (Forskal), is one of the most important fish inthe China Sea. In this paper the morphological charateristics of the eggs and the deve-lopment of the larvae, from hatching to about 14.7 mm in length are described. Mater-ials were obtained from artificial fertilization during the spawning season and alsocollected by plankton net at the mouth of Huang He, Bo Hai, northern part of theHuang Hai and off the coast of Qingdao in 1958 and 1964.