The evolution and sand source of the bar off the Fangcheng Port was under investigation from 1974-1978, the result of which indicated that this bar is a residue of the delta of the ancient Fangcheng River. Analysing the minerals and grain size, we found that the sand of the bar mainly came from the ancient Fangcheng River, and the sand carried by the present Fangcheng River has little effect on it. By using the methods of the comparative photographic map and calculation of wave and tide energy,silt accumulated on this part of waerway is found to be about 2.1-2.8×104m3 annually.The outer waterway is eroded in winter, and the sand again accumulated in summer. It is supposed that the amount of accumulation will be about 5-10×104m3 annually when the outer waterway is dragged to the depth of 7 m. The above mentioned result has been comfirmed by measurement from 1979-1981.