The lowest natural frequencies of short span pedestrian bridges are usually sufficiently high that they are not susceptible to human-induced vibrations.As spans increase

their lowest natural frequencies become lower and human-induced vibrations become a concern.The lowest frequencies of large-span pedestrian bridges are generally near to the one of walking people

which can result in the resonance of the bridge.It is not economical to avoid the resonance by adjusting the frequency of pedestrian bridge. However

the inclusion of vibration absorbers in pedestrian bridges can be a successful method of mitigating the effects of vertical responses.Multiple Tuned Mass Damper（MTMD） is a kind of dynamic absorber group that consists of a large number of small oscillators with distributed frequencies and damping or mass.In this paper

the control performance of MTMD for the vertical vibration of pedestrian bridges is studied.The mathematical model of a pedestrian bridge with MTMD is established and the transfer function and dynamic magnification factor（DMF） for the control system are derived.The parameters which may affect the DMF

including the numbers of TMD

the damping ratio of MTMD and the band of frequency ratios for MTMD

are analyzed.The analytical results can provide suggestions for the design of MTMD control of pedestrian bridges.The parameters of MTMD are optimized for a large-span pedestrian bridge in Shenyang City.The numerical results indicate that MTMD can effectively reduce the vibration of pedestrian bridge to the acceptable range.