This　paper　takes　the　time-domain　aeromagnetic　system　as　the　research　object　and　uses　the　finite　element　software　COMSOL　Multiphysics　6.0　to　establish　the　three-dimensional　system　model.　By　comparing　the　COMSOL　Multiphysics　forward　simulation　solution　with　the　one-dimensional　numerical　solution,　it　verifies　that　the　COMSOL　software　meets　the　simulation　accuracy　requirements　of　the　three-dimensional　time-domain　aeromagnetic　method,　and　focuses　on　the　analysis　of　the　transient　response　at　different　flight　altitudes　is　also　analyzed.　Based　on　the　analysis　of　this　paper,　a　set　of　aeromagnetic　parameters　with　high　detection　capability　is　determined　for　engineering　practice,　and　a　test　of　the　system　is　completed.