Abstract: The hybrid system is prepared basing on nitrile butadiene rubber (NBR) matrix with addition of 2,2'-methylenebis (4-methyl-6-tert-butyl-phenol)(AO-2246) hindered phenol. The flake graphite powder (FGP) was introduced into the system in order to study its impact on the dynamic mechanic property of the blends. The dynamic mechanic property of FGP/AO-2246-NBR blends was studied by DMA, FTIR, SEM, etc. The results suggest that after the addition of FGP into AO-2246-NBR blends, the tangent of loss angle, dynamic storage modulus and loss modulus all present a trend which increase and then decrease when the content of FGP increases. By the time the content of FGP reaches its critical value(mass ratio: about 10%), the dynamic mechanic property such as the tangent of loss angle, dynamic storage modulus and loss modulus would have better performance. According to the FTIR analysis, hydrogen bonding effect is not the key factor to the dynamic mechanic property of ternary blends system. It has great correlation to the characteristics of FGP itself as well as the formation of microstructure which results from the interaction between FGP and AO-2246-NBR blends.