Abstract: Attempt was made with the characteristics of creeping wave, to solve the difficult problem that the rabbet crack of areoengine blade could not be inspected on the original position. The insitu creeping wave testing principle was analyzed, and the detector and probe selecting ways were introduced. In order to determine the testing sensitivity, a kind of simulative specimens was designed. At last, the insitu inspection method was explained. The experimental results showed that the technique was effective to find out the cracks in the rabbet of engine blade with small size, high frequency, doublecrystal creeping wave probe. It is convenient, fast, sensitive and easy to be distinguished. So a new application field was opened up for the creeping wave testing technique.