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When the vehicle mass is reduced by 10%, the fuel consumption can be reduced by 3%–7%.1) Demands for safety together with the urge to reduce weight in order to increase fuel efficiency and reduce CO2 emission are driving forces of the rapid replacement of low carbon steel sheets in the automotive industry with advanced high strength steel sheets.2) 22MnB5 is one kind of high strength steel sheet that, after hot stamping, has a fully martensitic microstructure together with a high ultimate strength of up to 1 500 MPa or even higher.3) During the austenitizing process, boron element segregates at the austenite grain boundary. The segregation process contributes to the subsequent martensitic transformation, and thus improves the tensile strength of the material. Boron can increase the stability of undercooled austenite, thereby improving its hardenability.4) Resistance spot welding and laser welding5,6) are usually used to joint hot stamped steel. Resistance spot welding is the most widely used joint method in the car manufacturing. Usually a car has thousands of RSW joints. In resistance spot welding process, 22MnB5 is usually welded in quenched state. When it is welded after quenching, a series of problems may arise due to the influence of welding thermal cycle. Current research focuses on the microstructure and mechanical properties of 22MnB5 in resistance spot Optimization of Double-pulse Process in Resistance Spot Welding of Hot Stamped Steel Sheet