Abstract: In nuclear fusion reactors, joining the plasma material tungsten and structural material low activation steel is a key issue to manufacture tungsten/steel composite structures that can meet extremely harsh working requirements. The difficulties of joining tungsten and steel are introduced, and the research status of bonding technologies of tungsten/steel composite structure, thermal stress and stress reduction method of the joint, and mechanical properties of the joint are described in detail. It is pointed out that improving bonding technology and processes on the basis of systematic test and analysis of thermal conductivity, thermal fatigue resistance and working reliability in high temperature and strong radiation environment, standardizing test methods, and determining the priority and requirements of the key performance of tungsten/steel composite structures are the development direction of the research on tungsten/steel composite structure bonding technologies for nuclear fusion reactors.