To calculate power frequency electric and magnetic fields(PFEMF) generated by high voltage transmission line or space-crossing transmission lines accurately,based on charge simulation method(CSM) and Biot-Savart theorem,a universal model to calculate three dimensional PFEMF is built according to catenary equation,then the distribution of PFEMF under ordinary 330 kV double circuit transmission line on the same tower and that under the crossing transmission lines are calculated and measured.Calculation and me...