Abstract: Composite materials with negative Poisson's ratio have received extensive attention in recent years due to their excellent mechanical properties. The trapezoidal and sinusoidal two-dimensional double arrow carbon fiber composite sandwich structures were fabricated by molding and autoclave process. The vibration frequency response curves of the structures were obtained by frequency sweep test with shaking table. The three-dimensional finite element model of the structure was established and compared with the experimental results to verify the accuracy of the simulation model. Based on this, the effects of cell thickness, angle, topological configuration and thickness gradient on the vibration characteristics and damping performance of the structure were systematically studied. The results show that with the increase of the thickness and angle of the core cell, the natural frequency of the structure increases, the peak value of the acceleration response decreases, and the damping performance of the structure improves. Compared with the sinusoidal structure, the trapezoidal structure usually has higher natural frequency and better damping performance. Compared with other uniform and gradient structures, the weakening structure has better damping performance.