Abstract: For the problem of flow around the cylinder, many domestic and foreign scholars have done a lot of research, but there is limited research on the pollution caused by the surface coating of the column to the marine environment. In this paper, the concentration field caused by the wall surface contaminant flow under the action of two-dimensional cylinder is numerically simulated. Under the oscillating eddy current field generated by the flow around a cylinder with a Reynolds number of 75～175, the cylindrical surface pollutants are used as the wall condition, the concentration field under various oscillating eddy current fields is analyzed, and the correlation and distribution law between the concentration field and the eddy current field are analyzed. The numerical simulation results show that under the action of the oscillating eddy current field, the concentration distribution of the pollutants is synchronized with the distribution of the vortex, the concentration of the center of the vortex is relatively high, and the concentration at the edge of the vortex is relatively low. As the Reynolds number increases, the concentration of the vortex position decreases.