We　describe　the　Gorenstein　derived　categories　of　Gorenstein　rings　via　the　homotopy　categories　of　Gorenstein　injective　modules.　We　also　introduce　the　concept　of　Gorenstein　cosilting　complexes　and　study　its　basic　properties.　This　concept　is　generalized　by　cosilting　complexes　in　relative　homological　methods.　Furthermore,　we　investigate　the　exis-tence　of　the　relative　version　of　the　Bongartz’s　theorem　and　construct　a　Bongartz’s　complement　for　a　Gorenstein　precosilting　complex.　©　2023　Korean　Mathematical　Society.