Abstract: This paper analyzes the measurement method of radar cross section at normal temperature,then designs a high temperature RCS measurement method. The method improves the compact range RCS measurement system by developing a low scattering high temperature target support, selecting graphite to make high temperature target, using intermediate frequency induction heater to quickly heat the target, and carrying out cooling law experiment on hollow graphite. In the high temperature RCS test process, the time of each section is obtained by video recording, and the corresponding curve between the target body temperature and rotation angle is calculated. By analyzing the high temperature RCS of hollow graphite at 10 GHz VV polarization, it concludes that the average RCS error of this high temperature RCS measurement system is ≤ 1. 0 dB when the target's RCS is ≥-15 dBsm, so the high temperature RCS measurement system and the measurement method designed in this paper have high precision. This paper can provide a reference for high temperature RCS measurement research.