Abstract: Tianwen-2 is China's first mission for near-Earth asteroid sampling and main-belt comet exploration. After analyzing the orbital environment and operational requirement, a circular flexible solar wing configuration is adopted, addressing key constraints including operation under low-intensity low-temperature (LILT) conditions, reliable stowage during launch, and long-term tension management. High-efficiency triple-junction GaAs solar cells are developed through bandgap engineering and edge passivation, achieving an average conversion efficiency >34% at 2.5 au. The blanket design uses a modular, mirror-symmetric layout with planarized circuits and lightweight backing to ensure reliable stowage. Thermal simulation and tension compensation are employed to manage internal stresses, while ultra-lightweight support structures and planar stress-relief interconnects maintain ribbon stresses below 80% of the fatigue limit. Simulation and ground testing confirm that the array meets the mission's power needs, with post-deployment verification validating its output performance and operational stability.

Key words: Tianwen-2, deep space probe, solar array, flexible solar wing, low-intensity low-temperature (LILT)