Jellyfish are important planktonic organisms in aquatic environments, including cnidarians, mantle jellyfish, cross jellyfish, and cubozoans. Jellyfish is a very beautiful aquatic animal. Its body shape is like a transparent umbrella, the diameter of the umbrella body varies from large to small, and the diameter of the umbrella body of large jellyfish can reach 2 meters. The edge of the umbrella has some whisker-like tentacles, some tentacles can be as long as 20-30 meters. Jellyfish body is mainly composed of water, and by the inner and outer two embryonic layer is composed of, between the two layers there is a very thick gelatinous layer, not only transparent, but also has a floating effect. They are in motion, the use of the body of the water jet reflex forward, from a distance, like a top of the round umbrella in the water quickly drifting; some jellyfish umbrella body also has a variety of colors pattern, in the blue ocean, these swimming colorful jellyfish appear very beautiful.