It was found that there were badly oxidation phenomena in a superheater and a evaporator of CEFR's steam generators when they were being installed. So a static immersion test had been finished firstly by the sodium technology department of CEFR to investigate how to removing the rust from the CEFR's steam generators. But the site condition of CEFR's steam generators can not achieve the ndition of the means of removing rust only by static immersion. We decided to do the test of removing rust by flowing sodium of the samples of CEFR’ s steam generators to investigate behavior of the oxidation surface of CEFR's steam generators in the flowing sodium. The test would provide the testing foundation for the work of removing rust by flowing sodium on CEFR site. The test has utilized a mini-loop of sodium—“sodium loop for characteristic test of PEC's electromagnetism pump ” and simulated the work condition of CEFR's steam generators. Through the comparison between the photos of the samples which are before and after the test, the results about effect of removing rust of the samples under different conditions have been reached. These would provide the esting foundation for the work of removing rust by flowing sodium of CEFR’s steam generators.