For lack of temporal and spatial pattern of phytoplankton community structure in the Yellow Sea during the Holocene,biomarker records in core CO2 and NO5 were used to reconstruct the phytoplankton community structures,combined with published biomarker records.In the early Holocene,the relative ratios of alkenones(A/ΣPB)and brassicasterol(B/ΣPB)were low,while the relative ratio of dinosterol(D/ΣPB)was high.High value of TMBR’index indicates that the phytoplankton community structure was controlled by terrestrial nutrients during this period.In the mid Holocene,A/ΣPB increased,while B/ΣPB and D/ΣPB decreased.This is attributed to the Yellow Sea Warm Current intrusion with high temperature and high salinity.A/ΣPB increased significantly at core sites ZY3,ZY2,ZY1 and YE-2(35.5°N zone),while slightly at core sites CO2 and NO5.The Yellow Sea Warm Current flowed through the 35.5°N zone,controlling the phytoplankton community structure in the zone.However,the phytoplankton community structure in site CO2 and NO5 was