Taurine is of good medical-care function in physiology. There are many methods to extract taurine, but a new method was worked out by comparing and analyzing experimental results, that is, extracting taurine from meretrix meretrix by isoelectric point method. This new method offer advantages such as simple in operation, easy in controlling, no pollution, higher yield and lower cost. It opens a new way for the extraction of taurine. The taurine's medical application in anti-cancer, blood pressure lowering, hypoglycemic effect, anti-senility and health-care activity were also discussed.