The grain size dependences of magnetic properties in the granular perovskite have been investigated. A structural phase transition from cubic perovskite to orthorhombic form and lattice parameter enlargements with grain growth have been observed. Simultaneously, a series of magnetic changes, including magnetization and Curie temperature, has been obtained with the change of grain size. These phenomena suggest a structure-coupled change of magnetism in the hole-doped manganese perovskites.