Three　kinds　of　Cu/ZSM-5　molecular　sieve　catalysts　with　different　copper　sources　(copper　nitrate,　copper　acetate　and　copper　sulfate)　were　prepared　by　rotary　evaporation　method.　NH　3　selective　catalytic　reduction　(NH　3　-SCR)　reaction　activity　of　Cu/ZSM-5　catalysts　was　investigated　and　physicochemical　properties　of　the　samples　were　characterized　by　XRD,　N　2　adsorption-desorption,　H　2　-TPR,　XPS　and　NH　3　-TPD　techniques.　The　results　show　that　the　different　of　copper　source　has　a　great　influence　on　the　medium　and　low　temperature　catalytic　performance　of　Cu/ZSM-5　catalysts.　The　activity　of　the　three　Cu/ZSM-5　catalysts　is　significantly　different　at　medium　and　low　temperature.　And　the　sample　with　copper　nitrate　as　precursor　obtains　the　best　medium　and　low　temperature　activity.The　NO　conversion　of　Cu　(N)/ZSM-5　reaches　91%　at　190　℃.　Characterization　results　show　that　the　doping　of　different　kinds　of　copper　salt　hardly　affects　the　structure　of　ZSM-5.　Moreover,　the　copper　source　affects　the　forms　of　copper　species　and　the　number　of　acid　sites　obviously.　Cu　(N)/ZSM-5　sample　possesses　the　largest　number　of　isolated　Cu　2+　species　and　moderately　acidic　sites.　Isolated　Cu　2+　is　beneficial　to　enhance　the　low　temperature　reduction　performance　of　the　catalyst,　and　moderately　acidic　sites　are　favorable　for　the　adsorption　and　activation　of　NH　3　.　Therefore,　the　Cu　(N)/ZSM-5　sample　has　the　best　medium　and　low　temperature　catalytic　performance.　©　2018,　Editorial　Office　of　＂CHEMICAL　ENGINEERING＂　(CHINA).　All　right　reserved.