Proper decrease in pouring temperature and increase in shell mold temperature are helpful to preventing hot tear. Some effective measures to prevent hot tear,including avoidance of liquid metal to impact mold cavity and of casting-sprue-runner to form rectangular structure, were proposed during design of gating system. The measures to prevent casting deformation is shown as follows: decreasing cooling rate of thin-walled location in casting, changing assembly direction of wax pattern to overcome the deformation owning to the gravity, possibly setting single ingate, adding reinforced rib, using reverse deflection and deformation transfer.