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To improve the processing quality of hot stamping for ultra high strength steel, taking a square slot as an example, the processing quality index Kriging model was constructed with the design variables of hardening temperature, die initial temperature, stamping velocity, die clearance and the responses values of temperature drop, springback value and thickness reduction ratio. On this basis, a multi-objective optimization model of process parameters was established with objective function of the constructed Kriging model. Then, the optimal process parameters of hot stamping were searched by non-dominated sorting genetic algorithm Ⅱ. The concrete optimal process parameters of B1500HS ultra high strength steel were obtained at quenching temperature of 898.3 ℃, die initial temperature of 67.1 ℃, stamping velocity of 39.64 mm·s-1 and die clearance of 2.2 mm. The checking results after optimization indicate that the forming temperature is more uniform, the springback amount declines by 25.6%, and the thinning ratio reduces by 23%.
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