A fresh water decontamination promotion method of construction of the reclaimed land through the natural rain fall and artificial water application is provided that the natural rain can be utilized as the fresh water. A fresh water decontamination promotion method of construction of the reclaimed land through the natural rain fall and artificial water application comprises a step of classifying to the subdivision reclaimed land it partitions off the new reclaimed land; a step of setting up the fresh water bank(2) in the boundary of the subdivision reclaimed land; a step of filling up with the decontamination number(5) uses the fresh water bank, natural, the rain fall or the artificial water application; a step of deeply pumping out in the underground soil of the subdivision reclaimed land with the penetration decontamination number; a step of promoting the decontamination of the reclaimed land soil.
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