<p>Hydrogen dissolved from the moisture or the wire filler is formed on the surface of welded joint due to the driving of high-energy heat source. The diffused hydrogen in the welded joint could cause hydrogen embrittlement (HE). The important factors determining the HE resistance of welded joints are microstructure style, dislocation distribution, grains characteristics, precipitate particle, and residual stress. Different welding technologies show various heat sources and heat cycles, which result in different characteristics of fusion zone and heat-affected zone. Thus, the HE fracture behavior of welded joint produced by different welded technologies differs greatly. The current stage of HE behavior of welded joint was reviewed to provide fundamental reference for the scientists and engineers engaging in welding. The appearance of hydrogen atoms in the surface or interior of welded joint could weaken the bonding strength and change the fracture mode from ductile to sudden brittle fracture. Generally, the controlling of filler wire and heat input is a practical route to obtain the excellent welded joint with high HE resistance. The inhibition of hydrogen diffusion via the formation of fine coating and the aggregation of hydrogen atoms via the control of microstructure and precipitates are the effective routes to improve HE resistance.</p>