In recent years, Lemna sp. as one genea of duckweed utilized for many purposes in the world. First, Lemna sp. often used for water purification on water waste treatment because of its ability to concentrate minerals on heavily polluted water. The cells can concentrate the metal compound on his body. Secondly, Lemna sp. can be used as subtitution feed for animal livestock. We can extract many kind of nutrition e.g. protein, fiber, mineral from this plant. And finally, Lemna sp. also can be used as fertilizer on farm. The mineral compositions on this plant can subtitute the UREA manure so we can push down the cost on farming. For that reasons, people now can start to use this Lemna sp. for many kind of purpose.