The　low　thermal　conductivity　of　amorphous　epoxy　resin　significantly　limits　its　applications　in　electronics.　In　this　paper,　the　thermal　conductivity　of　cross-linked　epoxy　resin　was　investigated　by　Green-Kubo　method.　A　stepwise　crosslinking　method　was　adopted　to　construct　the　molecular　model.　In　order　to　verify　the　correlation　lengths　effect,　four　different　correlation　lengths　are　considered　under　the　same　integral　time.　The　contributions　of　curing　agent　types　and　conversions　towards　thermal　conductivity　are　discussed.