By　means　of　a　vacuum　induction　furnace,　Cu-Ag-Cr　and　Cu-Ag　alloy　are　produced.　The　influences　of　trace　Cr　element　addition　on　the　microstructure　and　mechanical　properties　the　Cu-Ag　alloy　were　studied　by　means　of　tensile　test,　optical　microscopy　and　transmission　electron　microscopy.　The　results　show　that　the　strength　and　rescrystallization　temperature　of　the　Cu-Ag　alloy　increase　effectively　with　the　trace　addition　of　Cr,　the　tensile　strength　reach　423MPa　after　annealing　at　450°C　for　2h,　which　are　satisfied　for　high　strength　and　high　conductivity.　Fine　grain　strengthening,　precipitation　strengthening　and　substructure　strengthening　caused　by　trace　Cr　should　be　responsible　for　the　strengthening　of　Cu-Ag　alloy.