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Tungsten,due to its unique low sputtering and erosion rate,is a candidate plasma-facing material for controlled fusion experiments like International Thermonuclear Experimental Reactor.It is well-known that He has a strong tendency to precipitate into cluster in tungsten via a variety of possible diffusion mechanisms,and the coalescence and growth of clusters are able to produce swelling and blistering,which resulted in the surface damage.The He-induced surface damage caused by helium blistering and helium sputtering,which caused significant morphology changes in the surface of tungsten.Depending on the irradiation condition,different changes in the microstructure of tungsten occur.