Abstract: In order to understand the impact of electromagnetic radiation on power inspectors who work on a high voltage transmission tower equipped with a mobile base station, we investigate the electromagnetic field distribution characteristics of the mobile base station co-located with high voltage transmission tower. Electromagnetic field intensity measurements in the realistic scenario of 4G base station co-located with 220 kV high-voltage transmission tower are performed, and field intensity measurement data in the ground area around the tower and in the vertical direction inside the tower are acquired. Based on the ray tracing simulation and depending on experimental verification, the electromagnetic field distribution characteristics of mobile base station co-located with high-voltage transmission tower are comprehensively analyzed. According to the measurement and simulation results, a method for partitioning strong, middle and weak field intensity areas is proposed. Finally, the radial basis function neural network is applied to the field strength prediction, and a prediction model for electromagnetic field distribution characteristics is established. These results can provide a reference for the safe operation and inspection in the scenario of mobile base station co-located with high voltage transmission tower.