Abstract: The Taihang mountain, with a long and thoroughly destructive history. is a mountain ecosystem with harsh ecologic environment. In the Seventh Five ?Year Plan, rhe reconstruction of the plant cover in the mountain was designated as a priority research project. From 1986,according to the principles of ecologic engineering, a new concept of integrated forest engineering, which includes mainly the acknowledging project of environment ( the selecting project of species , the mate prject of species the accumulation project of soil and water, the time rhythum project and the food-chain project had been undertaken. The experimental model in the small region of Xiang mountain had been built. By means of four years work , great progress had been made.