This paper focuses on the pressure shock wave generated by the electric explosion of the wire acts on the hole wall of the soil layer and form the belled piles caused by squeezing the soil at the bottom of the pile. The relationship function and simulation model between the explosive energy of the wire and the shock wave pressure are established， and the relationship between the discharge parameters and the shock wave intensity is analyzed. The relationship between shock wave pressure and soil deformation is established， and the pressure required for the deformation of clay soil is calculated. The models of belled pile and equal diameter pile were made to verify the deformation characteristics of soil under the electric explosion of the wire， and the bearing capacity and pullout resistance of the two piles were compared and analyzed. Based on the electrical and technological parameters of the high-voltage pulse bottom expanding technology model test， the first high-voltage pulse belled pile with a diameter of 0.8m was constructed in China， and the “irrigation-expansion” integrated construction method was developed.