On the basis of the preliminary study of the prevention and treatment of Bohai Sea divers' dermatitis from 1983 to 1987, the morphological characteristic of 5. rosea (see section I ), the pathogenic organism of the divers' dermatitis, was studied in the field of systematic zoology, some aspect concerning medical pathogenic characteristic of the nematocysts from the red sea anemone (section I ) was studied from the point of view of pathophysiology,a preliminary study on active proteins from 5. rosea (section I ) was studied according to toxicology. The article further stated the pathogenic mechanism of the sea anemones' dermatitis, in order to go further into the new ways and methods for preventing and treating the divers' dermatitis.