Abstract: The content and its composition were conducted to the suspended particle (SP) samples obtained in Chukchi Sea (CS) during the 4^th Chinese Arctic Research Expedition, 2010, with an attempt to understand the distribution and origin of the suspended matter there, which is essential for sedimentary and paleo-climate and environment change researches. The results show that the content of SP is the lowest in the central CS, and is the highest in the middle and bottom column of the southern and central-northern CS, and the content along the Alaska coastal area and in the Barrow Canyon is relative higher. The SEM of the SP shows that the SP in the southern and central-northern CS is mainly composed of diatoms, however the dominant species in those two area are different. The SP along the Alaska coastal area and in the Barrow Canyon is mainly composed of clasts of bio-skeletons. Combined with the distribution of temperature and salinity, the higher content of SP in the southern CS is controlled by the summer Pacific Water via Bering Strait. The higher content of SP in the central-northern CS is controlled by the Pacific Water which reached to there in winter. The SP in the middle and bottom column along the Alaska coastal line and in Barrow Canyon is controlled by the Alaska Coastal Water.

Key words: Chukchi Sea, suspended particle, distribution, composition, marine currents