Although lost foam casting（LFC）exhibits many advantages in producing planet gear frame

there exists easily shrinkage porosity（hole） due to its ductile iron and structure features.Shrinkage porosity（hole） was visualized at the key position of the castings by simulating the initial process with the help of the CAE software.The trial-production was conducted to verify the feasibility of the simulated results.The results were accordant with the simulated ones.The casting process was optimized on the basis of proportion solidification theory combined with the CAE software

and qualified planet gear frame was produced successfully.