Virtual and real space form of packaging structure constitute overall form of packaging space. There are two typical forms of identical body of uniformity and distinct body of balance in packaging structure. The identical body of uniformity defines form of outside contouring in real space. With absolutely equal distribution of virtual form, it leads to dominant balance of static sensation and obvious balance of axial symmetry form, which reflects aesthetic serenity. The distinct body of balance adjusts form of outside contouring in real space. With absolutely un-equal distribution of virtual form, it shows dominant balance of dynamic sensation and obvious balance of non-axial symmetry form, which reflects aesthetic vivacity.