Based on the principle of electromagnetic oscillation and high-voltage tip discharge , tesla coil isused to simulate lightning and its magnetic field in nature.The lightning magnetic field is measured by TES-593hree-dimensional electromagnetic measuring instrument,and the relationship between discharge frequency fdischarge pulse width I and lightning magnetic field is explored.Using the original method called simulationanalysis with transient tracking ,the magnetic field distribution at different heights can be simulated.Therefore.the relationship between lightning magnetic field distribution and lightning height from the ground is exploredon this basis.