The conditions for micro determination of Vanadium with 5-Br-PADAP as a chromogenic agent have been tested. The complex formation occurs in phosphate medium in the presence of H2O2 at pH 2.0-2.25.Detection limit of Vanadium is 10 ppm. It has been Confirmed that Vanadium, 5-Br-PADAP and H20f forms a ternary complex, and the combined ratio of this complex is 1:1:1。