Abstract: Mo-Re alloys are one of promising materials for the future application. But Mo-Re alloys are sensitive to carbon, nitrogen and oxygen elements, which are easily oxidized. Pores and brittle compounds formed in joints cause serious drops in properties. Therefore, many scholars researched on the weldability of Mo-Re alloys. The research status of electron beam welding, laser welding, resistance spot welding, vacuum brazing and friction stir welding of Mo-Re alloys at home and abroad were summarized. The common problems in welding were analyzed and summarized, and reduction in brittle compounds, pores and cracks is the key to obtain good joints.