The isoprenoid and branched glycerol dialkyl glycerol tetraethers (GDGTs) in marine sediments have been widely studied for paleoreconstruction purpose. However, their characteristics in the deep ocean (>4000m) were not well recognized. This study analyzed GDGTs in surface sediments from seamount area of the western Pacific Ocean. The results were further compared with existed data of GDGTs in the South China Sea (SCS), equatorial Pacific Ocean, and Mariana Trench to reveal the provenance of GDGTs and their capability in reconstructing paleoceanography. The isoGDGTs in seamount and Mariana Trench area clustered into a group in the RDA plots, which are characterized by higher fractional abundance of GDGT-0 (30-49%, 26-46%), indicating more similar sources of isoGDGTs from mixture of both planktonic and benthic Thaumarchaeota in both regions, than those in SCS (12-23%) and equatorial Pacific Ocean (22-28%). Benthic Thaumarchaeota likely produced excessive GDGT-0 in seamount area. For brGDGTs, the IIIa/IIa (1.67-4.83) ratios in seamount area was higher than marine-derived values of 0.92, indicating in situ production of brGDGTs with low values of #rings_tetra (0.12-0.42). The sea surface temperature, deduced by TetraEther index (TEX₈₆), varied from 22.6°C to 26.9 °C, which was close to observed in situ SST with the discrepancy ranging from 0.7 to 5.0°C. However, the positive correlation between ǀΔRIǀ and fractional abundance of GDGT-0 (R² = 0.83) indicated that sedimentary isoGDGTs, derived from benthic Thaumarchaeota, led to the bias of TEX₈₆ proxies.