Abstract: Four different arc modes which includes CMT,CMT-pulse（ CMT-P）,CMT-Advanced（ CMT-ADV） and CMT pulse advanced（ CMT-PADV） were used to deposit 2219-Al wire. The effects of different power modes on porosity,pore size distribution,microstructure evolution and mechanical properties were analyzed. In order to test the mechanical properties of 2219 aluminum alloy,a number of single channel multi-layer thin wall walls have been deposited by four different arc modes. The statistical distribution of the porosity shows that the CMTPADV model has the smallest pore area percentage,and there are almost no larger diameter stomata. The results of optical microscope and scanning electron microscope show that the grain of CMT-PADV mold is more uniform and fine,and the fine second phase Al₂Cu particles are precipitated. In addition,the X diffraction analysis of the sample shows that the lattice parameter of the sample at CMT-PADV mode is the least,and the content of solute Cu is the highest. The results of mechanical properties show that the tensile strength of CMT-PADV mode in horizontal direction is less than 5 MPa in vertical direction,and its mechanical properties have been improved obviously compared with other three modes.