Abstract: A hindered phenol/nitrile---butadiene rubber (NBR) composite was successfully prepared by mixing tetrakis (methylene-3-(3-5-ditert-butyl-4-hydroxy phenyl) propionyloxy) methane (AO-60) into NBR．The microstructure of the AO-60/NBR composite was characterized by DSC, SEM and DMA, and its dynamic mechanical properties were studied. The results show that the dispersion of AO-60 is different in the various NBR matrix. Hindered phenol AO-60 forms a fine dispersion in the matrix of the NBR with the acrylonitrile mass fraction of 35% (N230S). A strong intermolecular interaction is formed between the AO---60 and NBR. Compared with the neat NBR matrix, the value of T_g and tanδ for the composites increases gradually with increasing the AO-60 amount. Moreover, AO-60/N230S composites have a high performance as a damping material.