Abstract: In order to explore the influence of process parameters on the low pressure casting process of the brake isolation disc and reduce casting defects, the gating system with two internal runners was designed. ProCast software was used to simulate the filling and solidification process. The location of casting defects was predicted to be located in the thick part of the middle ring and the lower base ring and rib plate. By properly increasing the filling pressure, raising the die preheating temperature to 350℃, adding a water-cooled channel between the center ring of the web and the bottom away from the inner gate and the rib plate, and adding cold iron to the contact part of the web and the inner ring, the sequential solidification of castings is realized, the macroscopic defects of shrinkage porosity and shrinkage holes are basically eliminated, and good quality castings are obtained.