The　Cu-1.1　wt%　Hf-0.1　wt%　Si　alloy　containing　various　precipitates　is　studied　as　a　novel　precipitation-strengthened　alloy　with　high　strength　and　high　electrical　conductivity.　The　Cu-Hf-Si　alloy　prepared　by　solution,　cold　rolling,　and　aging　processes　exhibits　a　hardness　of　238.92　HV,　a　tensile　strength　of　691.01　MPa,　a　breaking　elongation　of　15.09%,　and　an　electrical　conductivity　of　62.34%　International　Annealed　Copper　Standard.　The　optimal　peak　aging　parameter　for　Cu-Hf-Si　alloy　is　430　&　DEG;C　for　90　min.　The　precipitation　of　Hf　and　Si　atoms　from　the　Cu　matrix　is　helpful　to　enhance　the　electrical　conductivity.　The　precipitation　of　Hf　can　produce　fibrous　Guinier　Preston　zone　and　&　gamma;＇　precipitate,　as　well　as　spherical　Cu10Hf7　phases.　In　addition,　the　coprecipitation　of　Si　and　Hf　can　also　produce　Hf3(Cu2Si)2　and　HfCuSi　phases.　The　high　strength　of　Cu-Hf-Si　alloy　is　mainly　due　to　the　multiprecipitates　synergistic　strengthening.　A　novel　precipitation-strengthened　Cu-1.1　wt%　Hf-0.1　wt%　Si　alloy　with　high　strength　and　high　electrical　conductivity　is　prepared　by　solution,　cold-rolling,　and　aging　processes.　The　precipitation　of　Hf　and　Si　atoms　from　the　matrix　is　helpful　to　enhance　the　electrical　conductivity.　The　high　strength　of　Cu-Hf-Si　alloy　is　mainly　due　to　the　multiprecipitates　synergistic　strengthening.image　&　COPY;　2023　WILEY-VCH　GmbH