Abstract: The paper presents a short review on research and application of nanomaterials and nanotechnology in welding field. According to its special properties, it is discussed that the application mechanism and probabilities of nanomaterials and nanotechnology in welding consumables, welded structure, hard welding materials, welding protection and other aspects.The article describes the application of nanomaterials and nanotechnology in welding consumables such as the coating of wires and welding rods, fluxes, electrode materials, as well as in the improvement of uneven structure, resistance to wear, fatigue and stress corrosion of welded joint.The question about raw materials, cost, entering mode and reactive mechanism are put forward.The application prospects of nanomaterials and nanotechnology in the welding field are forecasted.