Abstract: The conditions of separation of Cl^-, Br^- and I^- by reversed-phase chromatog-hy using N₂₃₅-silica gel or N₂₆₃-silica gel as stationary phase were studied. ions were separated within₃₂ minutes by using NaNO₃ as mobile phase. The ride and bromide contents of some samples were simultaneously determined. The hods of determining Vm were studied in detail. The chromatographic behaviour Cl^-, Br^- and I^- on N₂₃₅ and N₂₆₃ was investigated. An empirical formula of ulating retention values was obtained.