Abstract: The structure and technical requirements of steering axle housing castings were analyzed to formulate an initial casting process scheme. The casting method was determined, the pouring position and parting surface were selected, the sand core and movable block were designed, the cross-sectional areas of each unit in the pouring system were calculated. Numerical simulation technology was used to simulate the filling and solidification process. It was found that the shrinkage defects emerged in the isolated liquid-phase region on both sides of the casting, while the concave defects occurred at the top cone due to liquid shrinkage. Based on the analysis results, the castingprocess was optimized by adding risers. The feasibility of the optimized scheme was verified through numerical simulation and cutting tests. The results show that the casting defects are effectively eliminated and the casting quality is ensured by this optimized process, which can provide valuable experience for the production and process optimization of similar parts.