Supported by the Scientific Funds for Outstanding Young Scientists of China (No.50325723), the Teaching and Research Award Program for Outstanding Young Teachers in Higher Eduacation Institutions of MoE, China (No.[2001]182) and the Specialized Research Fund for the Doctoral Program of Higher Education (No.20020079003) in this thesis, the numerical methods for electromagnetic fields of overhead conductors and grounding systems in complex soil structure in frequency domain are researched and applied to pract...