Abstract:Meiobenthos abundance, biomass and its relation to the sedimentary environment in the East China Sea and the Yellow Sea were investigated based on samples collected by R/V Beido in autumn (October, 2000) and spring (April 2001). The dominant sediment type was very poor sorted silt-clay, with median diameter (MDφ) from 5.64 to 8.26, and silt-clay content from 85.7% to 99.8%, this was found in the bottom of the cold water mass in central Yellow Sea, off the Yentze River estuary and in the southern part of Zh...