Abstract: In order to improve the safety of transmission tower,the paper proposes a method to reduce the contact and step voltage around the tower by using inclined shaft grounding electrode. Firstly,the contact and step voltage distribution of grounding device is analyzed to obtain the optimal dip angle of the inclined shaft grounding electrode,and the influence of the number and length of the inclined shaft grounding electrode on the optimal dip angle is studied. Then the safety of the grounding device is analyzed,and the limit curve of the grounding current is obtained. Finally,personal safety protection measures are put forward. The research shows that the contact and step voltage around the tower can be significantly reduced by using the inclined shaft grounding electrode with the optimal dip angle. The risk of personal electrocution can be greatly reduced by setting a safe distance and laying high resistivity media on the surface.