Abstract: About 5×10⁴ kg mixture is removed from the supercooler in the vacuum thermal test of spacecraft, carrying 10⁸ kJ of cold energy. After an introduction of the status in using natural cold energy and LNG cold energy, this paper proposes a combined cycle reclaim method on the utilization of LN₂ and GN₂ mixture, which can be used in the vacuum thermal test, and the key points are the supply continuity of LN₂ and GN₂ and how to develop a secondary cold intermedium.