The thermal control system (TCS) provides effective and stable support to the on-orbit running of the alpha magnetic spectrometer (AMS) running on the International Space Station (ISS). Long-time monitoring of the TCS presents temperature warnings occurred on the circulation box (Box-C) of the transitional radiation detector (TRD)

tracker plane 1 and photomultiplier tube of lower time of flight detector in particular cases. The monitoring also presents that the operations of both starboard solar arrays and thermal radiator of the ISS can affect the local temperature of AMS. In this paper

by analyzing the temperature data in different cases

the influence of locking solar arrays of the ISS to the three components mentioned above is given. The most optimized angle factor of the starboard thermal radiator of the ISS reflecting solar irradiation to AMS is calculated

the calculation is verified by actual tests

the analysis of thermal response of the components is given

which indicates the validity of the TCS. Based on the analysis above

the approaches of controlling unusual temperature are proposed

which provides references to the on-orbit thermal control of AMS.