Abstract: This article summarized that the farmland are polluted by heavy metal, radioactive matter, nitrate and organic chlorines etc because of sewage irrigation, unreasonably using chemical fertilizer and pesticide, and diggings pollution. There are different approaches reforming polluted farmland, for example planting super accumulator (occluding some crop cultivars and wilding), using availability microbe to manage land and mix seed, using chemistry matter such as organic acid and lime, and using organic matter. These approaches have well effects to purify and improve the polluted farmland. At the same time author analyses the applying foreground of plant repairing and regulating principle of assuring effects, emphasizes the effect will even more good if synthesis technology was reasonably arranged in pairs.