Abstract: In order to improve the mechanical properties of aluminum-based structures, the flexural strength of CFRP-aluminum-based composite structures was investigated through a combination of experiments and finite element simulations. CFRP-aluminum-based composite specimens with different numbers of carbon fiber layers (1～4 layers) were fabricated, and their flexural strength was tested using a three-point bending (ENF) test. The results show that carbon fiber reinforcement significantly enhances the load-bearing capacity of the composite structure, and the flexural strength of the composite is markedly higher than that of pure aluminum alloy specimens.The primary failure mode of the CFRP-aluminum-based composite is interfacial delamination within the adhesive layer, accompanied by a sharp decrease in load-bearing capacity at failure, indicating that the strength of the adhesive interface is a key factor affecting the overall performance of the composite structure. The ENF model established in ABAQUS verifies the reliability of the experimental data, providing a theoretical basis and technical support for the application of CFRP-aluminum-based composite structures in lightweight engineering fields.