The efficient and economical tool enzymes for isolating protoplasts of Porphyra yezoensis from the digestive glands of four shellfish(Monodonta labio,Chlorostoma rusticum,Littorina brevicula,Acanthochiton rubrolineatus),cellulase and pectinase from internal market were studied.Results indicated that the mixture of shellfish enzyme and cellulase was more effective than any single enzyme in isolating protoplasts of Porphyra yezoensis.The mixture of digestive enzyme from Monodonta labio and cellulase was the b...