| Wood Plastic Composites (WPC) was a kind of modified thermoplastic materials filled with wood fiber or vegetable fiber, which could be extruded or suppressed as profile,plates or something else to replace both the wood and plastic. More and more attention was paid to the WPC because of its wide application value and market potential. However, the production process was still far away from perfection, therefore several beneficial trials about the process optimization based upon the dumped plastic reutilization were done.In this paper, HDPE/Wood fibber wood-plastic composite materials were produced by twin-screw extruder granulation, meanwhile the dumped HDPE for cable recycled from TianJin ZiYa Resources Recycling Industry District was took as the source of plastic, and three kinds of wood fibers (fir, poplar, bamboo) were selected as wood powder. Besides, enhancing effect of the three coupling agents (EAA,POE,PE-g-MAH) towards the compatibility of the wood and plastic was analyzed.Furthermore,valuable exploration of the surface properties of the wood-plastic composite interface was executed through the capillary rise method. Several factors which could impact the interface strength of the wood-plastic composite interface were discussed. For this purpose, the surface free energy of the three wood fiber and their changes in the high-temperature treatment were measured. A fairly good prediction and theoretical clarification about the mechanic properties of the wood-plastic composite materials synthesized under the different conditions was achieved.Optimal process conditions obtained from this study listed below: the extrusion temperature for the twin-screw extruder was 150℃～155℃; rotator speed was 30～40r·min-1; fir was chose as wood fiber, with its optimal addition 60phr , EAA as coupling agent, with its optimal addition 10phr. The tensile strength of the wood-plastic obtained under the optimum condition was increased by 33.19% compared with that acquired from other conditions.
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