In　this　paper,　water-based　silver　copper　alloy　nanofluids　were　prepared　by　liquid　phase　reduction　method,　and　their　absorbance,　thermal　conductivity　and　viscosity　were　tested.　The　results　showed　that　when　the　injection　flow　rate　of　precursor　was　0.5　mL/min,　the　reaction　temperature　was　70　and　the　molar　ratio　of　surfactant　polyvinylpyrrolidone　(PVP)　was　7,　the　peak　absorbance　of　nanofluids　showed　the　highest　value;　With　the　increase　of　injection　flow　and　reaction　temperature,　the　thermal　conductivity　of　nanofluids　increased　first　and　then　decreased.　When　the　injection　flow　was　0.5　mL/min　and　the　fluid　temperature　was　80,　the　thermal　conductivity　increased　by　16.81%;　When　the　reaction　temperature　is　70　and　the　fluid　temperature　is　40,　the　thermal　conductivity　of　nanofluids　is　12.16%　higher　than　that　of　deionized　water;　The　viscosity　of　nanofluids　increases　with　the　increase　of　injection　flow　rate.　The　reaction　temperature　has　an　important　effect　on　the　viscosity　of　nanofluids.　When　the　reaction　temperature　is　80,　the　viscosity　of　the　prepared　nanofluids　is　the　highest,　which　is　30%　higher　than　that　of　deionized　water　at　25.　©　2023,　Science　Press.　All　right　reserved.