In order to improve the reliability of power supply, it is more and more common to carry out live work. However, there are few reports on the safe access to the equipotential path on the transmission line under special conditions (with lightning arrester). This paper uses finite element analysis software to establish a calculation model for the equipotential entry of the transmission line with lightning arrester for live work. Taking the common ZB1 tower of the 500 kV EHV transmission line with arrester as an example, the safe access to the equipotential path is analyzed, and the operator enters The possible path of equipotential is the research object. The surface electric field of the operator at different positions is simulated and calculated, and the change law of the surface field strength of the operator entering the equipotential from different paths is obtained; The comparative analysis of the field strength of hands, knees, and feet suggests that it is most appropriate for operators to enter the equipotential safely along the diagonally upward path of the conductor under the two types of working conditions.