produces the eluent on-line, the electrolytic water produces the cathodic and electrolytic water required for the conductance inhibition to complete the on-line regeneration of the trapping column so that the analysis of the ion chromatogram requires only the preparation of the high purity water carry out. Can save time and manpower, while eliminating the manual configuration of the eluent caused by the error, effectively improve the analysis of reproducibility. Can upgrade the ion chromatograph to the reagent-free ion chromatographic analysis system so that the original constant current pump system automatically completes the multi-step gradient leaching.