The present invention relates to compositions for preventing or treating angiogenesis-mediated diseases or allergic diseases which contain, as an active ingredient, an EC-SOD protein or a vector having a polynucleotide encoding thereof. The EC-SOD protein or the vector having a polynucleotide encoding the EC-SOD protein has the effect on inhibiting angiogenesis by inhibiting the expression of VEGF and MMP-9 which induce angiogenesis. Therefore, the EC-SOD protein or the vector may be useful for preventing or treating angiogenesis-mediated diseases. And the EC-SOD protein or the vector having a polynucleotide encoding said EC-SOD protein also has the effect on inhibiting over-differentiation of Th2 cells which cause allergic diseases, inhibiting transcription factor (NF-&kgr； B), and reducing degranulation of human mast cells. Accordingly, the EC-SOD protein or the vector may be useful for preventing or treating allergy diseases. In addition, the inventive method for preparing an EC-SOD protein may be used in preparing an EC-SOD protein having the activity on a large scale. Therefore, the inventive method may be useful industrially.
