Abstract: The experiments of arc-laser free deposition and arc-laser microcasting forging additive manufacturing were carried out for ZL114A aluminum alloy. The influence mechanism of process conditions on the metallurgical defects, microstructure, mechanical properties and SEM morphology of the fracture of the aluminum alloy was investigated.The result shows that the arc-laser microcasting forging additive forming process can significantly inhibit the formation of pores in the forming process, and the microstructure is more fine and uniform, eutectic silicon is dispersively distributed in grains.Compared with those of arc-laser free deposition additive manufacturing process, the tensile strength, plasticity and brinell hardness in deposition scanning direction and z direction are increased. The fracture of the samples obtained by the two processes is fine equiaxed dimples, while there are fewer micro-pores in the tensile fracture of arc-laser microcasting forging additive manufacturing.