Considering research is influenced by the properties of the wood-plastic composite (WPC) components, we first studied the performance of the raw and processed materials. Secondly, we researched the changed characteristics of WPCs after outdoor weathering. The change of weight and micromechanics was analyzed. The changes in the properties of WPCs were observed and analyzed using four high-tech instruments: Fourier-transform infrared spectrophoto-meter, differential scanning calorimetric, dynamic mechanical analysis, and scanning electron microscope. The results showed that the endothermic peak at near 60°C was the result of the decalescence of the desorption of rice hull's cellulose's adsorptive water. The melting point of high-density polyetylene (HDPE) in new WPCs was 126°C. Finally, we simulated various environmental factors (water, seawater, acid rain, fungus, ultraviolet radiation) at lab conditions and drew some conclusions: 1) In the artificial simulated water conditions, the dimension change's rule of different directions was width > thickness > length. In the same time conditions, the mean ratio value of different directions at various disposal conditions was width/length = 2.31, thickness/length = 1.87, and width/thickness = 1.34. 2) In the artificial simulated conditions, the micromechanic properties of the material showed the same decreasing trend. The material pieces gained weight in the artificial simulated seawater conditions. In the same time conditions, the gain range of wood was larger than the WPC. The ratio was about 17. In the artificial simulated acid rain conditions, the more acid there was, the more problems there were. In the artificial simulated fungus conditions, the gain rate was 0.78 percent for WPCs. In the artificial simulated combined ultraviolet (UV) radiation and water conditions, the absorbency peak of methylene -CH_2 distortion vibration and C = O flex vibration increased higher than that at outdoor weathering. This phenomenon showed the large effect of UV radiation on WPC properties.
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