Soil is an important part of the environment, which is the precious renewable resources. Soil heavy metal pollution is becoming more and more serious, which affects the normal function of soil, causes pollution of food chain, threats to human health and environmental quality. Mercury as one of the persistent toxic pollutants, is also one of the precedence-controlled pollutants, soil mercury pollution problem has aroused high attention of the world. In our country, mercury discharge of about 1.9×10~8 kg/a into environments, covering 3.2×10~4 ha contaminated farmland, mercury as a kind of toxic heavy metals is nonnecessary for human, posing a great risk to human health. Considering the circumstances of mercury pollution and the remediation demands, six kinds of commonly applied techniques were developed in the following aspects of working principles, researching progress, studying cases, advantages or disadvantages, and application scopes, and so on, supplying the technology support for the remediation plan of the mercury contaminated farmlands.
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