Abstract: In order to reduce the trial number of selective laser melting(SLM) and efficiently print an aluminum alloy submersible pump impeller,ANSYS software was used to simulate the stress,deformation and scraper collision in SLM forming process under different placement and support design schemes. By comparison,the impeller position-placement was determined as the optimal design scheme and the SLM forming was performed. There is no crack and obvious deformation on the surface of the trial-produced impeller,and no large pores in the inner part. The deviation analysis of the impeller was carried out by using laser scanning,it was found that that the maximum average deviation was 0.106 mm.After annealing,the tensile strength of the test rod can reach 257-264 MPa,and the elongation after fracture is 11%-12%.The simulation of SLM forming process of impeller can provide a useful reference for SLM forming layout and support design of aluminum alloy parts with similar structural characteristics.