Chapter 1: Literature review.- Chapter 2: Thermo-mechanical coupling constitutive equations of braided composites.- Chapter 3: Multi-scale geometrical model of 3-D braided composites.- Chapter 4: Transverse impact of braided beams.- Chapter 5: Transverse impact of braided tubes.- Chapter 6: Axial impact damages of braided tubes at room temperature.- Chapter 7: Axial impact damages of braided tubes at low temperature.- Chapter 8: Multiscale structure mechanisms on transverse impact damages in beams.- Chapter 9: Multiscale structure mechanisms on axial compressive impact damages.- Chapter 10: Impact strength with thermo-mechanical coupling effect.- Chapter 11: Summary.