The purpose of ductile iron casting parts treatment is aiming at two aspects: First, change the matrix to improve the performance of ductile iron casting parts; second is to eliminate stress of ductile iron casting parts.It is worth noting that the heat treatment of ductile iron casting parts can not change the original shape and distribution of graphite, which turned out to be flaky or spherical graphite flake or ball remains after heat treatment, and heat treatment of ductile iron casting parts will not change the size, as well as distribution.