Abstract: In order to make full use of the waste generated during the deep processing of red jujube, jujube pit (JP) and linear low density polyethylene (LLDPE) composites were prepared by injection molding method with JP and LLDPE as the main components. The static mechanical properties (tensile, flexural and impact) and dynamic mechanical properties (dynamic viscoelastic, creep behavior and stress relaxation behavior) were fully tested and analyzed. The static mechanical properties analysis show that the tensile and impact strength of JP/LLDPE composites are decreased as the JP contents increase, while the flexural strength of the composites is obviously improved. When the addition contents of JP reach 20wt%, the JP/LLDPE composite exhibit optimal flexural strength, which is 63.57% higher than that of pure LLDPE. Dynamic mechanical analysis confirms that the increase of JP contents is beneficial to improve the rigidity, creep resistance and stress relaxation of JP/LLDPE composites, but the increase of temperature adversely affects the creep resistance and stress relaxation resistance of JP/LLDPE composites.