Abstract: The biological technique to remediate river sediment polluted by heavy metal is a method to remove heavy metal or to reduce its toxicity from sediment, which includes microbial remediation, phytoremediation and phytomicrobial remediation. It has received wide attention for its advantages of low cost, high efficiency and dehydration. In this paper the progress of the biological technique to remediate heavy metal polluted river sediment during last decade was summarized. The bioleaching technique was described in detail from aspects of microbiology, molecubr biology and biosurfactant. The prospect of biological remediation of polluted sediment was also discussed.

Key words: Sanjiangyuan Nature Reserve, Forest-meadow ecotone, Rare and endangered plant species, Quantitative evaluating, Endangered grading, Conservation priorities sequence