[[abstract]]For all creatures in the universe, no matter in life form or inorganic, have to process through stages of birth, growing, aging, and death. It is a gradation process. The evolution of creatures from none existence to existence, from single to multi cells, from the ocean to the sky, a single point to various forms. It is full of changing and varieties. This also proves the idea of any form could be gradated to any other kind of forms. In the Visual Art definition, gradation is a rule of esthetic. The basic forms through size, orientation, position, colors, textures and shapes to gradate in rhythm as well as reorganize continuously to create feelings of rhythms, space and speed. The gradation scope includes various contents. General works are presented in abstract and/or geometry basic form to cope with skeleton to lay a linen relationship, on the other hand, the natural form of presentation are rare. Natural forms of gradation could relate different things together. This creates a fun atmosphere, and enables different subjects to explicit in an unintended manner to reach twisting image. This is a field worth developing. It is a trend to use computer as design aid and there are tow major software programs apply in visual arts: vector image and raster image. They have individual special functions and fit into unique presentations. The research uses natural form’s gradation as major axis, use computer as creating media to investigate limitations of these two software programs as well as their visual effects’ comparison.