关键词: 残留砂, 海底砂丘, 风成沉积, 外大陆架, 南海北部, 晚更新世

Abstract: According to the synthetical investigations in geology and geophysics, the results, obtained from the analysis of particle sizes of sediments and mineral composition , quartz grain analysis by scanning electorn microscope,dating ¹⁴C and nannofossils,show that: 1. During the last glaciation，most parts of the continental shelf area in the northern South China Sea were land. the climate was cold and arid in the winter. Northeast monsoocn wind prevails during that period. Sand were blown strongly by winds in the continental shelf area and sand dunes were widely distributed. 2. The micro-geomorphological occurrences such as remaining sands,seafloor sand dunes and sand ribbons，were mainly the wind sand and palaeo-sand dunes formed during the low sea level period in the last stage of the Pleistocene. They also were remoulded by the dynamic forces of the modern sea water.

Key words: remaining sand, seafloor sand dune, wind sediments, outer continental shelf, the northern of South China Sea, late Pleislocene