1, nutrients: Porphyra haitanensis is rich in nutrients such as protein, iodine, phosphorus, calcium and various amino acids, while ordinary laver mainly contains nutrients such as protein, dietary fiber, vitamins, calcium, potassium and magnesium.

2. Distribution area: Porphyra haitanensis is mainly distributed in Fujian and coastal areas in southern Zhejiang, while Porphyra haitanensis is mainly distributed in the north.

3. Mode of production: Porphyra haitanensis is a kind of artificially cultivated seaweed, which needs to be cleaned, baked and packaged, and is not ready-to-eat food. Ordinary laver is made by roasting laver and can be eaten directly.