Based on the FL-62 wind tunnel porous test section of the Aviation Industry Aerodynamics Research Institute of China, a full-model flutter double-cable suspension system is developed. This paper details the structural design and composition of the double-cable suspension system, and conducts ground test and simulation analysis research. The results show that the double-cable suspension system operates stably when the rear cable tension is between 1000– 4000 N, and it can effectively adjust the model's pitch angle. Ground vibration tests (GVT) are performed on the rigid body motion modes of the model supported by the double-cable system, revealing that the rigid body frequency of the suspension system meets the requirement of being less than one-third of the model's first elastic frequency, thus fulfilling the criteria for full-model flutter wind tunnel testing. Additionally, simulation analysis of the flutter characteristics of the full-model under both supported and unsupported conditions is conducted, identifying the influence law in flutter behavior.