Abstract: The stator casting process of a compressor was complicated, the period was long, the cost was high. In order to solve this problem, the casting scheme of stator was numerically simulated by ProCAST software and the causes of defects were analyzed. According to the defect position, the scheme was optimized from two aspects: pouring system structure and process parameters. Finally, the qualified Inconel718C superalloy stator castings were produced by investment casting process.The results show that the shrinkage cavity can be reduced by optimization. The optimized process parameters are casting temperature of 1480 ℃ and shell temperature of 1200 ℃.