The effect of fractal theory describes roughness and irregular geometric shapes in the nature or in non-linear system. In recent years fractal theory is extensively applied to many fields, such as mathematics, physics, chemistry, geography, earthquake and astronomy, computer science. In this paper, Visual C++ language is used to simulate fractal trees, snowflakes and cracks because of good use interface and strong computer programming technology. The parameter of the fractal graphics, such as recursive degree, length and rotation angle, can be modified by using the parameter dialogue box in order to obtain various fractal graphs. This paper focuses on the algorithm study of fractal simulation graphs.