Abstract: Pulse Electric Discharging (PED) is a novel technique that can modify solidifying structure and reduce grain size. Its effects applied to the high carbon liquid steel were presented here. The macrostructure and microstructure of the high carbon alloy steel were also observed. Results show that (1 ) the length of columnar crystal at the edge of ingot without PED treatment is much longer than that with PED, and (2) the perlite lamellae of steel billets after deposed by PED are twisted and shortened. An explanation of those experimental results is given.