, the common name of which is short arm octopus, belongs to Mollusca, Cephalopoda, Octopodidae, Octopus, and widely spreads in the Bohai Sea, the Yellow Sea, and north of the East China Sea. It is tasty, highly nutritive, and enjoyed by many people, so, it is of great economic value. A large amount of exported to Korea and Japan. Because of over-capture, its resource has been declining rapidly, and is in urgent need of ecological restoration. At the same time, has its advantages, eg, its life cycle is only one year, and it grows very fast. Therefore, it is a favorite species for artificial culture and proliferation discharge. Lots of research about embryonic development has been done on other cephalopod, such as .This study focused on reproductive behavior and embryonic development of . It was cultured in artificial environments for a month and then spawned. The female took care of her eggs from beginning till larva hatching. During this period, the female scarcely preyed, and died within fortnight after larva was hatched. The type of cleavage was discoidal cleavage. According to the standard of embryonic development, established by Naef, the process of embryonic development was categorized into 20 stages by characteristics. 2 reverses. The first reverse took place on the fifteenth day, in which embryonic anlage turned from animal pole to vegetal polethe second one was happened on the fortieth day, embryo turning from egg stalk to the opposite. In the end, larva was hatched after 41 d. The hatchling was planktonic, and they began benthic lifestyle about 12 d later. This research presented some useful data, which will be of great value on artificial breeding, culture and