Steel 1Cr13Mn13 was treated by electropulsing (EP) with high density after annealing+furnace cooling (AF) or solution+oil quenching+tempering (SOT). Tensile experiments show that the mechanical properties of the sample treated by SOT+EP process with a maximum current intensity about 8.46 kA/mm² were greatly improved, compared with the sample only treated by SOT process, its tensile strength and elongation increased from (1250±10) MPa and (20±1)\% to 1400 MPa and 53%, respectively. Metallographs show that the equiaxed grains formed under high temperature solid solution treatment were remained in both the SOT and SOT+EP samples. But the coarse lamellar martensite in the SOT sample was greatly refined after EP treatment. As the samples were treated by EP treatment, they successively underwent a rapidly “heating-cooling” process with a heating time less than 0.001 s and a cooling time less than 0.6 s, resulting in a successive phase transformation of α´→γ→α´. The lamellar α´ martensites formed during rapidly cooling process have more refined size than that of the primary martensite laths, which further enhanced the tensile ductility and tensile strength of steel 1Cr13Mn13. Moreover, the maximum value of current intensity for each EP treatment can also influence the mechanical properties of the samples by controlling the amount of the α´ phase in the transformation. A higher current intensity usually produces much more amount of α´ phase with smaller lamellar size and the mechanical properties of the samples are more improved. But if the maximum current intensity is much higher than an optimal range about 8.30-8.46 kA/mm², the sample is overheated and the mechanical properties will be lowered.