Abstract: This paper,based on using fractal theory to investigate the problem about protein structural fractals,from the nonlinear angle,explored and analyzed the relations between protein polypeptide structure and fractal,and between globin three-dimensional structural fractal dimensions and evolution.We suggest that not only the aspects can be discribed well by using fractal theory,but also it is more important that the fractal theory will probably offer the profitable enlightening and new information for people recognizing biological macromolecular nature and feature becanse of the complexity and nonlinearity in biosystem and the fractal nature in biological macromolecule of itself contains fractal nature.On the other hand,it will also provide a new way for using the nonlinear theory into the field of structural molecular biology.