China＇s　present　copper　smelting　technology　and　copper　slag　resources　status　are　introduced　and　the　occurrence　of　iron　in　copper　slag　generated　by　different　smelting　methods　is　analyzed.　In　view　of　the　characteristics　of　copper　slag,　the　available　copper　slag　reduction　treatment　methods　are　summarized　and　the　related　concepts　of　deep　reduction　technology　are　introduced.　According　to　the　different　types　of　reductants,　three　deeply　reduction　methods　for　iron　recovery　from　copper　slag　are　mainly　described,　including　gas-based　deep　reduction,　coal-based　deep　reduction　and　oil-based　deep　reduction,　and　the　deep　reduction　technology　and　its　development　prospect　are　expected.　©　2019,　China　National　Chemical　Information　Center.　All　right　reserved.