The　viscosity　and　conductivity　of　the　smelting　slag　of　copper　oxide　concentrate　are　important　for　reducing　the　operating　temperature.　In　this　study,　seven　slag　samples　were　prepared　by　the　reductive　smelting　of　copper　oxide　concentrate　with　different　ferrous　oxide　contents.　The　viscosity　and　conductivity　data　of　these　CaO-MgO-FeO-Al2O3-SiO2　samples　were　measured　in　the　temperature　range　of　1290　similar　to　1410　degrees　C.　Based　on　the　structural　features　of　aluminosilicate　melts,　the　change　and　dependency　relationships　of　their　viscosity　and　conductivity　were　analyzed.　The　results　show　that　there　is　a　strong　tendency　to　form　orthosilicate　even　when　the　slag　composition　is　acidic.　The　formation　of　fayalite　would　allow　more　Al3+　to　form　pyroxene　with　the　six-coordinated　structure.　As　a　result,　the　polymerization　degree　and　viscosity　of　the　melt　will　be　reduced.　The　[AlO](4)(5-)　as　a　network　former　will　reduce　the　bonding　strength　of　the　structural　units,　thus　reducing　the　slag　viscosity　at　high　temperature.　In　the　experimental　range,　the　logarithm　of　viscosity　of　each　slag　sample　has　a　good　linear　relationship　with　its　logarithm　of　conductivity.　However,　there　is　no　uniform　linear　equation　for　these　complex　slags　with　wide　composition　variations.　These　results　have　potential　guiding　significance　for　the　copper　smelting　process.