In　this　paper,　we　propose　a　3D　tree　simulation　method　which　is　based　on　fractal　theory　and　combined　with　the　morphological　characteristics　of　trees.　By　modifying　a　few　simple　parameters　we　can　achieve　the　realization　of　different　types　of　3D　tree　automated　generation.　According　to　the　tree　structure　fractal　self-similar　characteristic,　combined　with　the　morphological　characteristics　of　the　trees,　we　abstract　identified　class　to　realize　the　description　of　each　organ＇s　attributes　and　functions;　Using　random　control　function　to　improve　the　fractal　iterative　methods　to　make　the　generated　trees　more　realistic;　With　the　help　of　the　developing　platform　of　Visual　C++　language　and　OpenGL,　we　can　realize　3DTree＇s　optimize　modeling　and　visualization　simulation.　Experiments　show　that　the　method　generates　visually　convincing　results.　©　2013　Trans　Tech　Publications　Ltd,　Switzerland.