This paper shows that to develop the concept of forestry, especially the modern forestry concept is more important for forestry development. With its own background,forestry has passed three stages:traditional, classical and modern forestry in the world. In 1990s,the rapid development of system science and ecology have played a huge role to modern forestry-an integrate theory with the system and other more science which make a union to modern forestry in the way of eco-construction and system engineering method. Therefore,it is very importan...