The life cycle of the jellyfish passes through the main stages of fertilization, such as grafting on to the aphid and then connecting to the hydroid, which is the larva, and the transverse body, which is the butterfly, which becomes the jellyfish. In addition to the sexual reproduction process of fertilization in the body, the jellyfish hydra larvae will also give birth to creeping roots to form foot sacs, and even the transverse body will continue to be split into multiple discs, in order to asexual reproduction to increase the number of individuals.

In the near-shore waters, this gentle and graceful animal often arouses great affection and interest. But don't go down to the sea to embrace such an animal, the consequences and prospects are not good. Fresh jellyfish stinger sac contains venom, its toxin consists of a variety of skin substances, fishing jellyfish or swimming in the sea will be touched by people touching jellyfish tentacles will be touched, resulting in redness, swelling, heat and pain, epidermal necrosis, and there are generalized chills, irritability, chest tightness, pain at the injured area, etc., in serious cases, can be due to respiratory distress, shock and life-threatening. In summer, it is the peak season of jellyfish growth activities, but also fishermen in fishing operations or swimmers in the seaside swimming easy for its peak incidence of stings. Jellyfish are distributed in all coastal waters of China, and there are many kinds of jellyfish, which secrete toxins of different natures and hazards. However, due to differences in individual sensitivity, so after the jellyfish sting light only a general allergic reaction, the heavy can lead to death, so we must focus on effective prevention and active rescue treatment.