Mo-Cu　composite　powders　were　prepared　by　the　Sol-Gel　method　using　citric　acid　as　chelating　reagent.　The　composition,　morphology　and　particle　size　of　the　powders　were　studied　by　the　XRD　and　TEM.　TEM　observation　result　shows　the　particle　size　of　Mo-Cu　powders　is　about　150nm　after　reduction　and　the　Mo　grains　are　covered　homogeneously　by　Cu　on　the　surface.　The　reduction　behavior　and　mechanism　were　analyzed　systematically.　Temperature　programmed　reduction　(TPR)　results　indicate　that　the　appropriate　two-step　reduction　temperatures　are　500　degrees　C　and　700　degrees　C,　respectively.　The　results　from　FT-IR　show　that　the　bond　of　Mo=O　is　weakened　due　to　the　bond　of　Cu-O-Mo,　which　leads　to　the　increase　of　the　reduction　capability　of　the　Mo-Cu　composite　oxide　powders.