Abstract: The article mainly introduces that when the eddy current test of the titanium tube of the condenser is carried out, by selecting different frequencies, not only the eddy current can penetrate the wall of a certain thickness to perform defect detection, but also different. The frequency of inspections will have a certain difference in the quantitative measurement of defects. Through theoretical analysis and actual field test, this paper expounds how to choose the general method of eddy current test frequency and quantitative measurement of external wall thinning defects when implementing eddy current test of condenser titanium tube, which can provide reference for in-service inspection.