Both of the Chukchi Sea and Bering Sea,which are linked through Bering Strait,are key regions to study climate change. A comparative study of sedimentary process between the Chukchi Sea and Bering Sea was conducted via excess ~(210)Pb. The result from station NB22 in the Bering Sea indicated the impact of benthic fauna,while the biological activity in the benthic environment at station R17 in the Chukchi Sea was limited. The sediment accumulation rates at station R17 and station NB22 were 0.6 0.1 mm?a~(-1) and 2.1 0.07 mm?a~(-1),respectively. The particle mixing coefficients due to benthic fauna at station NB22 were 1.38 0.92 cm~2?a~(-1) without considering sediment process and 0.65 0.95 cm~2?a~(-1) with considering sediment process. The burial fluxes of organic carbon, biogenic opal,and CaCO_3 in the Bering Sea were 6.85 mmol C?m~(-2)?d~(-1),37.7 mmol Si?m~(-2)?d~(-1), and 3.15 mmol C?m~(-2)?d~(-1),respectively. Those fluxes in the Chukchi Sea were 5.71 mmol C?m~(-2)?d~(-1), 9.78 mmol Si?m~(-2)?d~(-1),and 3.08 mmol C?m~(-2)?d~(-1),respectively. Meanwhile,the Chukchi Sea is characterized by high efficiency of vertical marine biological pump. The lateral transport of marine biological pump may be significant in the shelf of Bering Sea. Therefore,the ~(210)Pb in the marine sediment could be applied not only to quantify sediment accumulation rate and burial fluxes for biogenic materials but also to indicate intensity of biological activity in benthic environment.