Abstract: Man-made forests of uneven-aged and irregular spaced broad leaved tree-Korean pine has been studied for years. The forest is rational at vertical structure. Sun light energy is fully utilized, inside it with the effect of temperature regulation. The forest has a strong water holding capability. The soil of the forest land is loose and fertile, the bulk density of the soil being rather light. Both the aeration and water permeability of the forest soil has been improved, with the helpful result for resolving organism.The average increment in growing stock in the man-made forest of uneven-aged and irrgular spaced was 2.9m²/ha·a during 10 years, increased 3 times as against even-aged pure Korean pine forest, while the increment of biomass was 4.1t/ha.a, 0.7% increased. The sum of investment, however, was only 35.26 Yuan/ha·a, which is 63% less as compared with that for pure Korean pine forest.