Electromagnetie field theory is difficult to teach , learn, and apply, and experiments are a window forstudents to understand application of electromagnetie fields.Graphics and images are interpreted based modern finite element simulation Maxwell and HFSS software. Based on Maxwell, taking electrie field of high-voltagetransmission line joints as an example, simulate the field distribution at the joints; Based on HFSS, taking rectangular air waveguide transmission lines as an example , analyze the periodic distribution of electromagneticfields.The experiment is based on solving electromagnetic field problems, forming a comprehensive electromagnetic field experimental experience through theoretical analysis, modeling and simulation, andpractical operation , cultivating students’ ability to analyze and solve problems using electromagnetic fieldheory, enhancing learning interest and engineering practice ability.