Abstract: To achieve omnidirectional observation, space telescopes typically require multiple attitude changes. However, such attitude changes lead to complex and variable external heat flows, which are highly detrimental to the heat dissipation of spacecraft instruments. Loop heat pipes are widely used in the aerospace field as components capable of long-distance, high-power heat transfer. For a space telescope equipped with several distributed instruments and operating with a total power consumption of up to 1300 W, multiple loop heat pipes, each 20 m in length and with a maximum heat transfer capacity of 400 W, were used for heat dissipation. Test results demonstrated that the loop heat pipes could transfer 400 W with a temperature difference of 13 ℃, effectively solving the challenge of unified heat management for distributed heat sources in spacecraft.