Abstract: To address the challenge of protecting a satellite’s servo power supply cable from hundred kW thermal plume impact, where traditional thermal insulation materials prove inadequate, a thermal protection design using Nomex sleeves was proposed in this paper. Thermal analysis calculations were conducted to select an appropriate Nomex sleeve product. Component-level and system-level engine plume tests demonstrate that the proposed scheme effectively reduces the cable temperature, meeting the protection requirement of less than or equal to 200 ℃, providing a design margin of over 50 ℃. It also ensures the cable’s heat dissipation and motion functions.