High-strength　7xxx　series　aluminum　alloys　are　of　great　importance　for　the　aerospace　industries.　However,　this　type　of　aluminum　alloys　has　poor　processability　for　most　additive　manufacturing　techniques.　In　this　paper,　a　newly　designed　Al-Zn-Mg　alloy　was　used　as　a　feeding　wire　to　fabricate　thin　wall-shaped　samples　using　the　wire　and　arc　additive　manufacturing　(WAAM)　technique.　These　samples　were　fabricated　based　on　the　cold　metal　transfer　(CMT)　process　with　four　different　types　of　arc　modes,　that　is,　CMT,　CMT-incorporated　pulse　(CMT　+　P),　CMT-incorporated　polarity　(CMT　+　A),　CMT-incorporated　pulse　and　polarity　(CMT　+　PA).　The　optical　microscopy,　x-ray　computed　tomography,　and　scanning　electron　microscopy　equipped　with　energy-dispersive　x-ray　spectroscopy　(EDS)　and　electron　backscatter　diffraction　(EBSD)　were　employed　to　characterize　the　microstructure　and　phase　constitution.　The　results　clearly　reveal　that　the　porosity　varies　with　the　arc　modes,　and　the　densest　sample　with　porosity　of　0.97%　was　obtained　using　the　CMT　+　P　mode.　The　mechanical　properties　of　the　fabricated　samples　are　also　dependent　on　the　arc　modes.　The　tensile　strength　and　yield　strength　of　the　sample　manufactured　by　the　CMT　+　PA　arc　mode　are　the　highest.　In　terms　of　anisotropy,　the　strength　differences　in　horizontal　and　vertical　direction　of　the　samples　made　by　CMT　+　PA,　CMT　+　A,　and　CMT　modes　are　all　large,　which　is　mainly　ascribed　to　the　pores　distributed　at　the　interlayer　region.