The speciation analysis and health risk assessment of aluminum in Porphyra haitanensis was carried out by sequential chemical extraction method and analyzed by inductively coupled plasma mass spectrometry(ICP-MS).The total content of aluminum was within the limits of 74.3-1 479 mg/kg in 30 samples.The content distribution of aluminum species in P.haitanensis was according to the order of insoluble Al>organic Al>inorganic Al>water soluble Al.Insoluble aluminum in P.haitanensis accounted for about 75% of the total Al.The greatest amount of soluble aluminum existed as organic Al,which accounted for 72% of the total soluble aluminum.The dominating form of inorganic aluminum was Al(OH)₃ and water soluble aluminum only accounted for 18.5% of inorganic aluminum.The percentage of dissolved aluminum in gastric stage only accounted for 1.38%-6.80% of the total aluminum,which indicated most of aluminum was insoluble during digestion process and health risk of aluminum which come from P.haitanensis was low.