A supporting structure of segmented mirror for Fourier telescope field experimental system is proposed, and the fabrication and assemble sequence of each part are introduced. The segmented mirror, 6 meters in height and 5.5 meters in width, which is composed of 61 hexagon spherical sub-mirrors, is the biggest segmented mirror telescope used for energy collecting in China till now. The sub-mirror cell is designed in modular block so that it is interchangeable and its three FOD precision adjust can be realized. The supporting truss adopts fission structure for its assemble and transport to become easy. The ground base uses pre-embedded bar and beton. Each component joins with the ground base by bolts. In this way, the integer rigidity is ensured and the temperature adaptability is also satisfied. The experiment indicates that the stability of support structure is better than 0.075 mrad and the angle adjust accuracy is better than 0.05 mrad. The co-focus experiment of 8 segments which are already assembled indicates that superposition accuracy of spots center of mass is less than 20 mm. All the results above show that the proposed supporting structure satisfies the technical requirements of the field experimental system.