It is known very little about the life history of Amphioctopus kagoshimensis (Ortmann, 1888). In particular, there are no descriptions of the early life stages which enable correct identification of samples taken from the wild. In this study, reproductive behavior and process of embryonic development are described. They were cultured in the artificial environment and spawned one month later. The female took care of her eggs from beginning till larvae hatch. During this period, the female scarcely preyed, and died within 1-2 weeks after larva hatched. The type of cleavage was discoidal cleavage. According to the standard of embryonic development, established by Naef(1928), the process of the embryonic development were categorized into 20 stages by their characteristics. Two reverses of embryonic occurred during the embryonic development of Amphioctopus kagashimensis. At 21℃of water temperature, the first reverse took place on 10-11day, in which embryonic anlage turned from animal pole to vegetal pole; the second reserve was happened on 31day, embryo turning from egg stalk to the opposite, and larvae hatched after 33 days. The eggs and paralarvae was small, with an egg length of 2.93 ± 0.08 mm, a dorsal mantle length of 2.34 ± 0.03 mm and a total paralarvae length of 3.13 ± 0.03mm. The hatchlings were planktonic, and they began the benthic lifestyle about 45 days later. This study presented some useful data, which will be of great value on artificial breeding, culture and proliferation discharge.