The　hidden　trouble,　when　using　mobile　communication　devices　under　explosive　gas　environment,　is　studied　in　this　paper.　The　mobile　communication　devices　will　radiate　electromagnetic　energy　when　they　are　in　work.　Some　of　the　energy　will　be　absorbed　by　the　conductors　or　medium　placed　in　the　field.　If　the　absorbed　energy　discharges　under　certain　condition　and　the　energy　excesses　the　minimal　igniting　energy　(MIE)　of　the　explosive　gas,　explosion　will　occur.　This　article　analyses　the　transfer　of　electromagnetic　energy　and　an　energy-discharging　model　is　made.　It　will　provide　reference　it,hen　making　the　safety　standard　of　using　mobile　communication　devices　under　explosive　gas　environment.