Hexabromocyclododecanes (HBCDs) and dechlorance plus (DP) are ubiquitous emerging persistent organic pollutants (POPs) in the environment. However, their Antarctic environmental levels and bioaccumulation are not clear. Therefore, the present study will select Sub-Antarctic South Shetland Islands and Fildes Peninsula coastal area, investigate the distribution characteristics of the isomers (α, β, γ-HBCD and syn-DP, anti-DP, Dec 602, 603, 604) in the area, and assess the bioaccumulation and biomagnification in marine food webs. The air, snow, soil, seawater, sediments and marine organisms will be sampled and analyzed to clarify HBCD and DP patterns, including their isomer concentrations, ratios and indications, elucidating the transfer and fate of HBCDs and DP in the coastal sub-Antarctic multimedia region. Important, bioaccumulation and biomagnification of HBCD and DP isomer in two typical food chains will be quantified. Based on all the studies, we will summarize the sub-Antarctic distributional characteristics and bioaccumulation patterns of the various HBCD and DP, and compare the distribution in the region with that reported in other areas. The project will reveal the polar environmental occurrence, migration and bioaccumulation of the new POPs, which are of great significance to better understand the pollution and risks under the global environment and climate change.