Based on the aquaculture data of Hainan Province in 2017,this paper uses the excretion coefficient method and the ratio of crop grain to calculate the total amount of nitrogen,phosphorus and potassium nutrients in livestock manure and straw in Hainan Province；and calculates the livestock and poultry carrying capacity in each region according to 50% of livestock manure. The ratio of quantity to actual aquaculture was used to evaluate the risk of agricultural land in various areas of Hainan...
