Abstract: The microstructure and hydrogen embrittlement properties of 2205 duplex stainless steel annealed at 1000℃and 1150℃for 5 min were studied.The results show that, as the annealing temperature increases, the grain size increases, the iron body content increases, and the hydrogen fragility sensitivity also increases.Hydrogen charging leads to an increase in the yield strength and a decrease in the tensile strength of the steel.At the same time, a brittle region appears in the fracture, and the thickness of the region increases with the increase of the annealing temperature.The fracture mode of the brittle region affected by hydrogen is a mixed fracture mode of cleavage fracture and quasi-cleavage fracture, and the annealing temperature can affect the fracture mode of the region.