Through the study of theory of fractal geometry in nonlinear science ,the article applies it to the structure of the plant root development and analyzes the fractal characteristics of root of lemongrass which is collected from the uranium tailing .the article uses Fractal Fox software to calculate the fractal dimension of plant roots ,and the results showed that the fractal dimension of plant roots changes between 1 .258 to 1 .470 ,which indicates that the fractal characteristics of roots are obvious .In addition ,the experiment discovers that the fractal dimension of plant roots beside the w ...