During the submerged plant induced black bloom period in Lake Taihu, sediment cores were collected and pore waters were acquired using peeper in-situ passive pore water samplers at the black bloom and the control areas. The sediments analysis results showed that the water content, porosity and organic matter (LOI) were obviously higher in the surface sediment (0-7 cm) in the black bloom area than those in the control area, among which the LOI contents were about 4 times higher. The physical and chemical characteristics of surface sediments were influenced by the submerged plant residues greatly. Ammonium (NH₄⁺-N), soluble reactive phosphorus (SRP) and Fe²⁺ contents in surface pore waters at the black bloom area were significantly higher than those at the control area. The sediment release fluxes of NH₄⁺-N, SRP, and Fe²⁺ were also estimated by using the pore water diffusion model approach. Compared to the control area, the release fluxes of NH₄⁺-N, SRP, and Fe²⁺ in the black bloom area were 49.8, 15.3, and 123.1 times higher, respectively. The research implied that the increase of nutrients contents in the submerged plant induced black bloom were mainly due to sediments release, to which the black bloom caused anoxic condition was the major driving factor.