Abstract: In order to prevent the petrochemical reactor system damage caused by the media leakage of tube, the eddy current testing was carried out for the tube. The comparing sample tube was made according to the occured defects possibly during the actual operation. With the difference across eddy current probe, the testing results were compared between the comparing sample tube and the actual tube. The tube defects status was obtained, which well met with the actual situation through the anatomy trail proving.