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In this experimental study,field observations and laboratory experiments have been carried out to assess the impacts of the vegetated channel walls and aspect ratio on flow velocity profiles,shear stress distribution and roughness coefficient of channel.Results show that the presence of vegetation cover on channel wall causes deviation of the Reynolds stress distribution from the linear one under uniform flow condition.It is also noticed that the Reynolds stress distribution is influenced by the aspect ratio(W/h).The vegetation cover planted on the flume wall considerably influences the location of the Umax.With the changes of the position of Umax,the zero Reynolds stress position also changes.The Manning coefficient n of channel with gravel bed and vegetated walls have been assessed and calculated by using the boundary layer characteristics method.