Abstract: This paper discusses the application and experimental method of acoustic emission(AE) for characterizing 3-D braided composite material under tensile and flexural fatigue loading.It describes the features of acoustic emission when applied to 3-D braided composite material under tensile and flexural fatigue loading.The results of tension experiment show the stress-strain curve exhibits linear relation for 3-D braided composite material with smaller surface braided angle and the tensile failure presents brittleness feature.When the surface braided angle is bigger,the stress-strain curve shows bilinear relation and tensile failure presents brittleness damage,respectively.The results of flexural experiment show load-deflection curve is linear relation for 3-D braided composite material with smaller surface braided angle,while the load-deflection curve is non-linear relation with bigger surface braided angle.