The structure of precision casting attention should be paid to tend to reduce casting defects:1, the precision casting wall thickness should be uniform, in order to prevent the shrinkage cavity, cracking, when need to ensure that directional solidification conditions, should try to make it in one direction change of wall thickness, when the need to guarantee the solidification conditions at the same time, should try to make it have broken wall thickness, etc.2, precision casting wall and wall should be protected from sharp corners and connection between the metal concentration, thick wall and thin wall should be gradual transition, beware of mutation, lest cause thermal and stress concentration, the formation of hot crack, shrinkage, etc.3, precision castings of local thick section, should as far as possible use hollow out or cast hole structure, and to strengthen rib appropriate reinforcement.4, precision casting plane wall of the hole, application of convex edge reinforcement, in order to reduce wall thickness.5, precision casting structure should make it as far as possible without resistance to contraction on cooling.6, should try to avoid the precision casting with large horizontal plane.Waterways within 7, precision casting, gas path, such as the interlining cavity of large area, should have some connection column.