Abstract: The principle and process characteristics of RES welding technology were described. Taking the hot forming steel 22MnB5 and high strength aluminum alloy TL091 as the objects, through reasonable combination and optimization of welding parameters, the weldability of joints was systematically analyzed by means of metallographic analysis and mechanical properties analysis. The RES welding technology was adopted to realize high quality connection of the two plates successfully. It provided a new welding technology for the welding of automobile body hot forming steel and high strength aluminum alloy, and solved the problem of connection between automobile hot forming steel and high strength aluminum alloy. At the same time, combining with product design and quality requirements, the evaluation standard and basis for joint quality evaluation were given, which enriched RES welding technology system.