The invention relates to a measuring method of a basifier ethanolamine for a nuclear power station secondary circuit system and a fuel electric plant feed water system. The measuring method comprises the following steps of: testing an electric conductivity peak value when ethanolamine reach a peak value by taking an ion chromatograph as a testing means and by utilizing a specific instrument working condition; drawing a standard operation curve by taking electric conductivity pair concentration of peak-peaks, and adopting a quadratic regression equation method; and directing calculating the concentration of the ethanolamine in an unknown water sample so as to obtain the exact concentration of the ethanolamine through software of an instrument workstation according to the electric conductivities of the measured peak-peaks. The measuring method provided by the invention has the advantages that the operation is simple and convenient and rapid, the test is exact, the precision is high, the reproducibility is good, so that a simple and practicable method for quantitative testing of the trace-amount ethanolamine in high-purity water of a generating station.