The wood-plastic composite (WPC) has the characteristics of both the wood and plastic with a good ability of durations and obtains a wide application among different areas, especially in logistic packaging. A recycled corrugated paper board and LDPE were used to explore the effects of fiber content, compatibilizer LDPE-g-MAH, and forming agent AC on the performance of composites. The results show that: the optimum fiber loading remains 40%~50% to obtain a best tensile strength and bending strength; the addition of LDPE-g-MAH can improve the composite mechanical performance and the best level is 5% of total weight; the foamed composites have a low density and relative high mechanical properties, and the optimum content is about 3%.