This paper is the third part of a series review on the settling velocity of fine sediment in tidal environment.On the basis of the afore-mentioned contexts and related literatures，the influential factor of determining the settling velocity is analyzed.The findings of this review are as follows：1) Suspended sediment concentration (SSC) is taken as one of the major determinants for the settling process of fine sediment.When SSC is in a small range，the settling velocity is increasing with SSC，but it will fall down with SSC when the magnitude of SSC is over a greater value；2) The dependency of temperature on the settling velocity needs more attention in the future，and the salinity has significant contribution to the settling velocity； 3) SSC，temperature and salinity all manifest their influences on the settling velocity to different extents.The dependency between SV of estuarine fine sediments and its various determinants (SSC，salinity，temperature，etc.) rely highly on some given conditions.