In　order　to　enhance　conversion　efficiency　and　spurious　free　dynamic　range　of　microwave　photonic　link,　we　present　a　microwave　photonic　down-conversion　system　based　on　an　integrated　dual-parallel　Mach　Zehnder　modulator　(DPMZM)　and　microwave　photonic　filter.　The　principle　of　frequency　down　conversion　is　analyzed.　We　demonstrate　the　conversion　efficiency　of　system　through　theoretical　derivation　and　simulation.　The　performance　of　the　microwave　photonic　link　is　tested　experimentally.　It　is　found　that　the　spurious　free　dynamic　range　of　the　proposed　method　is　up　to　102.5dB/Hz(2/3)　and　the　conversion　efficiency　is　up　to　-22.01dB.　The　integrated　dual-parallel　Mach-Zehnder　modulator　link　can　serve　as　a　good　alternative　to　improve　the　conversion　efficiency　and　spurious　free　dynamic　range.