Fluorescent sand tracer were injected in a point in the surf zone and the core samples were taken from sixteen points around it on three beaches facing to the pacific Ocean. At the same time, the horizontal two components of current velocities were measured at the injection point. Based on the result of data analyses, the conclusions are obtained as follows: 1) The advection speed of sand in the mean current direction is about 1% of current velocity. 2) That in the principal wave direction is affected by the up-and-down and the before-and-behind asymmetry of velocity profiles. 3) The mixing depth is proportional to the mean-square value of fluid velocities. 4) The equations for local sand transport rate are empirically obtained.