Abstract: Field observation and flume experiments indicate that bedload sediment in meanders takes two simultaneous motions, one part along the same bank, and the other part to the opposite bank. However, few quantitative studies can be found in the literature. The authors have simulated the flow and bedload transport in a 110° sine-generated meandering laboratorial flume by applying a two-dimensional depth-averaged model of unsteady flow and sediment transport, viz. CCHE2D. The calculations indicate two erosion zones of distinctively high scour intensity created in the process of bed deformation, one in the foreside of point bars at convex bank and the other near concave bank. In the early stage of bed deformation, nearly all the sediment eroded from these two zones are transported along the same banks, neither crossing the channel centerline nor moving to the opposite bank. After the equilibrium topography is reached, however, the main flow will gradually converge to the concave bank. Meanwhile, the moving paths of all particles are constrained to a concave bank-crossing bars-concave bank belt.