This　study　explores　the　hydrogen　trapping　capability　and　hydrogen　embrittlement　(HE)　of　a　second-generation　single　crystal　(SX)　superalloy.　Embrittlement　susceptibility　is　greater　as　the　duration　of　hydrogen　charging　is　extended.　The　presence　of　hydrogen　induces　cleavage,　micro-crack　formation　and　denser　slip　traces.　Moreover,　hydrogen　facilitates　the　formation　of　nano-voids　and　the　activation　of　high-density　dislocations,　leading　to　denser　slip　bands　which　serve　as　initiation　sites　for　micro-cracks.　In　addition,　the　desorption　activation　energy　of　hydrogen　trapped　at　dislocations　and　soluble　in　the　gamma　matrix　is　33.7　kJ/mol,　and　hydrogen　trapped　at　the　gamma/gamma　＇　interface　and　vacancies　is　42.4　kJ/mol.　First-principles　calculations　have　indicated　that　hydrogen　reduces　the　binding　strength　at　the　gamma/gamma　＇　interface,　which　promotes　the　propagation　of　micro-cracks.