Epoxidized natural rubber (ENR) was filled with starch and molybdenum disulfide (MoS2) on different ratios. The curing properties and viscoelastic behavior of the composites was tested by rubber processing analyzer, and the morphological structure of the composites samples were characterized by SEM. The mechanical properties, the thermal decomposition behavior, tensile strength, hardness value, friction coefficient, abrasion resistance and swelling ratio were investigated to verify the property improvement of the ENR composites. From the results of all the tests, it can be found that the intermolecular interaction increased with increasing starch content. And the mechanical properties also increased. The possible reason may be the starch could provide the better combination with ENR rubber matrix due to the hydrogen bonding. And with the addition of molybdenum disulfide, the friction coefficient and abrasion resistance properties were improved due to the lubrication of molybdenum disulfide.