Abstract: To improve the crashworthiness of aircraft, the impact dynamic characteristics of 2D triaxial braided composite fuselage frame were investigated. Based on continuum damage mechanics, a finite element model of the fuselage frame under impact load was developed where irreversible thermodynamic theory combined with Weibull distribution and Hashin failure criterion were utilized to establish the damage growth law and determine damage threshold function, respectively. Shear stress was coupled with normal stress and the damage modes in both longitudinal and transverse direction of the material were considered independently in the iteration procedure. On this basis, the effects of varying material parameters on the impact dynamic performances of the frame were analyzed, and the transient response characteristics and energy absorption behaviors were compared further. Numerical results show that the finite element model is able to deal with this nonlinear transient dynamical problem accurately. The deviation between the simulation and the test on peak load is 1.5%, while absorbed energy is 4.7%. Besides, the longitudinal material parameters such as Young's modulus and compression strength have a significant influence on the dynamic response of the fuselage frame.