Bromelain is isolated from the stems, leaves and the skin of pineapple by employing modern biological extraction technology. It is mainly composed of protease and many others contents. Its activity specification is indicated by GDU/g and the maximum activity specification on can reach up to 3000GDU/g. Bromelain could hydrolyze is the protein and health products, food, cosmetics, forage, leather ,industry and so on. Because it has the function of strongly decomposing fibrin and the blood clot, therefore especially is remarkable effect in the medical application.