Abstract: The extrusion method was applied to prepare rice husk/high density polyethylene (HDPE) and rice husk biochar/HDPE composites. The morphological properties of the rice husk/HDPE and rice husk biochar/HDPE composites were evaluated by SEM and XRD analysis, the mechanical properties and creep resistance of composites were also observed and compared. The results show that the combination of rice husk/HDPE composites is so different from rice husk biochar/HDPE composites:rice husk/HDPE composites show that the husk is covered by HDPE, rice husk biochar/HDPE composites show HDPE is embedded in the pores of rice husk biochar; The XRD shows that both rice husk and rice husk biocar can affect the intensity of the peaks of the composites but have little effect on the crystallite structure; And whether it is bending, tensile or creep resistance, rice husk biochar/HDPE composites are much stronger than those of rice husk/HDPE composites.