With respect to SEL (Single Event Latch-up) found in GPS (Global Positioning System) receiver of LEO (Low Earth Orbit) satellite, temperature influence after SEL has presented. Details on orbital element shifting are discussed. Satellite transponder is investigated to be thermally sensitized by analyzing AGC (Auto Gain Control) variation and carrier locking characteristic. When transponder AGC is less than 0.82V, carrier signal acquisition is reliable with transponder working temperature lower than 26.2°C. Degraded application to GPS receiver is carried out to turn off orbital PCB (Printed Circuit Board). The results imply that, after the orbital PCB shutdown, GPS receiver works with normal positioning data and TIC (Time In Continuity) data and temperature below 20.5°C, and has a low probability of SEL with mitigation of temperature influence, and satellite transponder is still applicable to obtain carrier signal acquisition time more than 150s and is able to fulfill the requirements of telecomm and in the uplink. The Degradation has used in long-term management for lots of satellites on-orbit in TT&C (Telemetry, Tracking and Command).