The present invention belongs to the field of high voltage engineering technology. It relates to a method for reducing earthing resistance of transmission transforming substation in the area with narrow field area and high soil resistance to ensure safety and reliable operation of power system. Said method includes the following steps: adopting soil geologic structure analysis, grounding system design and blasting grounding construction method, including: for vertical grounding electrode, making blasting grounding construction to produce grounding crack, pressing the low-resistance material into the deep hole, blasted gap and crack, and utilizing the low-resistance material to communicate soil structure of underground large range and promote the contact of grounding electrode with rock and earth, and utilizing underground low-resistance layer and rock cracks to implement said invention. |