Abstract: This paper describes the application and experimental method of acoustic emission(AE) for three-dimensional(3-D) braided composite material under compressive fatigue loading and presents the features of acoustic emission during compressive test process for(three-)dimensional braided composite material.The experiment results show that the AE parameters can elaborate the failure mechanism of inner deformation of the three-dimensional braided composite material under different conditions.The surface braided angle is an important parameter affecting the mechanical properties of the three-dimensional braided composite material.When the braided angle is less than 30 degree,it has better compressive property;and when the braided angle is larger than 40 degree,its compressive property shows remarkably declined.The research has provided a theoretical basis for mechanics analysis and technique improvement of the composite material.