Abstract: The characteristics of noise and crack-related acoustic emission signals(CRAES) during fatigue test of an aircraft were analyzed, and different methods were advised for corresponding CRAES. The combination of parameter analysis and waveform analysis was shown successful for a posteriori analysis of the AE data of fatigue test. Some classical characteristics of CRAES were gained which were closely related with some details of fatigue damages. These results might have important referencing and instructional meanings for future AE monitoring during fatigue test.