系统研究了铌（V）与氯代磺酚S的显色反应，优化了反应条件．考察了该显色体系的分析性能，研究了样品的分解方法，拟定了用光度法分析包头铁矿及其冶炼渣中铌的方案． The color reaction of niobium (V) with chlorosulfonates S was systematically studied, and the reaction conditions were optimized. The analytical performance of the chromogenic system was investigated. The decomposition method of the sample was studied. The scheme of spectrophotometry for the analysis of niobium in Baotou iron ore and its smelting slag was proposed.