Abstract: The nonlinear finite element method is adopted to analyze the possibility of coupling vibrations of cables and the bridge of long span cable-stayed bridges due to vehicles. A cable-stayed bridge with span of 1400 m is studied as a case. Results show that the dynamic responses of cable supports due to vehicles are obtained through vehicle-bridge coupling vibration analyses, and are taken as stimulations in nonlinear vibration calculation of steel and CFRP cables. Results show that the displacement amplitudes of both steel and CFRP cables are not big; the local vibration of a long-span steel cable due to the action of vehicle is observed because its frequency is close to the main frequencies of the bridge; but the CFRP cables vibrate with the bridge because its stiffness is greater. Besides, the influence of lasting time on the amplitude of cables is not obvious. The predominant frequencies of the dynamic responses of the bridge have no obvious relation with that of cables in the primary frequency range of cables. The large amplitude cable-bridge coupling vibration due to vehicular loads is not possible to occur.