Abstract: AlSi10Mg alloys were fabricated by the selective laser melting (SLM) with the optimal process parameters. The microstructure, tensile property, impact property and relative density in the directions parallel and perpendicular to SLM forming direction were studied and compared, and the forming quality of SLM formed inclined planes with different inclination angles were also analyzed. The results show that the microstructure in the direction parallel to SLM forming direction was different from that in the direction perpendicular to SLM forming direction. The tensile strength, yield strength, elongation and impact energy of the specimen sampled perpendicular to SLM forming direction was 364 MPa, 303 MPa, 6.7%, 5.1 J, which were higher than that parallel to SLM forming direction; when the inclination angle was less than 45°, the forming quality of the inclined plane was good; the collapsing defects were observed at the bottom of the inclined plane with the inclination angle over 50°.