The invention provides a 99mTc complex taking iminodiacetic acid as a difunctional chelating agent. Structure of the complex is shown as a formula (1). The complex has the advantages of simplicity in preparation, low cost, high marking rate, radiochemical purity, target to non-target ratio and tumor uptake value, long residence time and low liver-kidney background. The complex can serve as a novel photographic developer marked by technetium-99m and used for positive tumor diagnosis of intergrin alpha v beta 3 receptor to be applied in the technical field of radioactive medicinal chemistry and clinical nuclear medicine.