Abstract: Chemical forms of heavy metals (Cu, Fe, Mn, Ni, Pb and Zn( in Taihu Lake sediments are studied using BCR sequential extraction procedure, HCl-HNO3-HF digestion method and ICP-AES. The results show that the BCR method has better stability for heavy metals chemical forms extraction of Taihu Lake sediment. Affected by the geochemical properties of the heavy metals and the physiochemical characteristics of the sediments, Cu, Fe, Ni, Zn are mainly associated with residual fraction, Mn is mainly associated with exchangeable and carbonate fractions, Pb has the identical distribution in organic/sulphide fractions, Fe/Mn oxide fractions and residual fraction; the Fe/Mn oxide fractions of heavy metals have good correlation with Mn of Fe/Mn oxide fractions, and the organic/sulphide fractions of the heavy metals have good correlation with TOC.