Abstract: With the development of re-entry vehicle, accurately measuring the micro rolling moments generated by ablation is increasingly required. In this paper, a low damping free-rolling measurement technique based on gas bearing is presented. This technique which was applied to Φ1 m hypersonic wind tunnel based on the innovation and improvement of corresponding work in small-scale hypersonic wind tunnel. The micro rolling moments can be well deducted and analyzed with multiple test design and data processing method, including the traditional data processing method and flight dynamics simulation technology. The related re-entry vehicle model tests were conducted in Φ1 m hypersonic wind tunnel with series test conditions, especially at high angle of attack and high Mach number. The reasonable and reliable test results show the robustness of the proposed testing system, which can provide support for the related design work of re-entry vehicle.