The invention relates to an ecological repairing method of sphagna macroalgae to an eutrophic
open sea area, which is mainly characterized by comprising the following steps: selecting a cultivating area; fabricating a raft frame and a lace curtain of a cultivating facility; pulling seedlings of conchospores cultivated by a
seedling net, conveying the
seedling net, hanging the lace curtain and managing the
dryness; managing the cultivation of ripe sphagna macroalgae in sea; picking the ripe sphagna macroalgae; and measuring
nitrogen and
phosphorus in texture. Sphagna can obviously reduce the danger of large-area
red tide induced by excessive elements such as
nitrogen,
phosphorus, and the like in a neritic zone, can be used as a repair tool of water
eutrophication in the neritic zone, is cultivated in the eutrophic sea area so that necessary
nutrient substances can be provided and
nutrient substances in sea can be transformed out of a
pollution system through the harvest, therefore, the application of the ecological repairing method can achieve the purposes of inhibiting the growth of
red tide microalgae, and releasing and eliminating
eutrophication, and also obtains higher economical value.