Abstract: The damage process of aircraft composite T-shaped structure under tensile load is studied by acoustic emission technology, and the damage mechanism of composite specimens under tensile load is discussed. The acoustic emission signals collected from the tensile test are analyzed by parameter analysis method, and acoustic emission signal characteristics and corresponding loads of matrix cracking, delamination, fiber fracture to complete loss of bearing capacity in the tensile process of the T-shaped structure are obtained. The results show that acoustic emission technology can accurately predict the damage process of composite T-shaped structural parts under tensile load, and can provide reference for the detection of this kind of structural parts.