In this paper, we focused on a new decorative light density board with a new fiber unit-- micron wood flake, which were large size in length and a very small size in thickness. With these flakes, we processed the light density board in the laboratory, Cunninghamia lanceolata abounded in Fujian Province, Paulownia tomentosa from Anhui Province, L.gemelini Rupr., and Betulaceae abounded in Northeast of China were selected as raw materials, and modified UF as resin. Then several single factor experiments were conducted to discuss the effects of the factors on the physical and mechanical properties of the board, such as board density, resin content, and species of trees as well. The results showed that the density and resin content had significant effects on the mechanical properties of the board. The physical and mechanical properties of the samples, density ranged from 0.3 to 0.5g/cm3, reached Japanese Light Particleboard Standard JISA5908, and the thermal conduction of the board processed with the four species tree were just like solid wood.