This paper examines the relationship between the ion-exchange capacity of the packing and the results of analysis of Na+, NH4+
， K+ or Mg2+, Ca2+, Sr2+ ions in the indirect photometric chromatography.
Mg2+, Ca2+ and Ca2+, Sr2+ were 100% and 95% separated respectively by using 0.86 meq/g resin as packing in a micro high-performance liquid chromatography instrument. And the results of using 0.86, 1.197, 1.216 meq/g resins as packing respectively indicated that when the 0.86meq/g resin was used
， the chromatograms with highest sensitivity and lowest limit of detection were obtained while the analysis could be completed in a short time.
The curves of log (V E - V v) vs. - log [Cu2+] and the relationship between the peak heights and the concentrations of samples were also investigated.