An antibody for activating plasminogen is provided. The antibody is produced from a hybridoma cell line deposited on Nov. 24, 2011 under accession number BCRC 960433 at Food Industry Research and Development Institute, 331 Shih-Pin Road, Hsinchu 300, Taiwan. The uses and producing method of the antibody, and an agent including the antibody used for treating stroke, myocardial infarction or syndromes cause by thrombus are also disclosed.