Seedlings from the culture of somatic cells of Porphyra yezoensis havebeen done in Hai Feng sea farm of JiangSu province. The isolated single somaticcells was cultured with enriched seawater in temperature-controled room at 20℃ andunder 2000 lux illumination for 12-hour daily. After few days, some cells dividedand formed seedlihgs and most cells firstly divided into cell aggregates, then theaggregates released spores that germinated into sporelings. The cell seedlings grew 0.1-1mm in length in 15-20 days. Cultured at room for 15-87 days, the cell seed-lings on nets were moved into sea and cultivated with 2 batches. After 25 days laterthe cell seedlings of 1 st batch grew to about 10-15 cm in length. The content of total nitrogen and amino acids of the thalli were analyzed fromcell seedlings and traditional sporelings, and took to compare. The results showedthere were no change in total nitrogen and toll amino acids between cell seedlingsand traditional sporelings, though there were some changes in the content of somesmino acids, so there are no differece in nutrient value between the population ofthe cell seedlings and the traditional sporelings of Porphyra yezoensis.