When coin-tap method is applied to test honeycomb bonding structure, the detection sensitivity is reduced due to the increase of the skin thickness. To overcome this shortcoming, this paper designs a set of detection system consisting of computer, scanning mechanism and percussion hammer. The work improves the detection sensitivity and reliability of the product by combining the automatic control technology and C-scanning display technology. To verify system testing effects, artificial defects were designed. Experimental results are then presented which show good quantitative agreement with the artificial defects. As a result, the system is suitable for the product testing and beneficial to the objective evaluation of product quality.