Abstract: The present invention relates to an antibody, which specifically binds to tyrosine-protein kinase receptor TIE-2 (TIE2) so as to possess functions of blood vessel normalization and stabilization through receptor phosphorylation, and relates to: an anti-TIE2 antibody; a nucleic acid encoding same; a vector comprising the nucleic acid; a cell transformed with the vector; a method for preparing the antibody; an agent for stabilizing blood vessels and a composition for treating angiogenesis-associated diseases, both of which comprise the antibody; and a composition for co-administration with a pharmaceutical composition for tumor or cancer treatment and with a composition other than an antibody binding to TIE2.