Stability constants of anti-2-hydrozy-5-isoamyl-benzophenosime eatraotants with proton. copper (Ⅱ),iron (Ⅲ),cobalt (Ⅱ),nipkel(Ⅱ),zine (Ⅱ) were determined by using the Bjerrnm-Calvin pH titration technique. The measurements were carried out at 35±0.1℃ in 3:1 dioBane:water at constant ionic strength (0.1 M KNO₃).Stability constants of anti-2-hydrozy-3-sec-butyl-benzophenogime and anti-2-hydrozy-S-sec-butyl-benzophenosime eztraotants with proton,popper(Ⅱ) were also obtained.