The eluent generator is the core technology of the new generation reagent-free ion chromatograph. It realizes the function of generating the required concentration of eluent on-line only by adding pure water , eliminating the time-consuming operation of manual preparation of eluent, which greatly improves the automation of analysis and avoids the test error caused by human factors. At the same time, the intelligent control method can realize the self-defined setting of the concentration , the gradient elution and separation operation of complex samples that can not be completed by the equivalent pump, which further improves the accuracy of the analysis.