Abstract: Rare earths(RE) in agriculture has great economic benefits，already cover agriculture，forest industry，fishery，herd industry and domestic animals(birds) breed aquatics industry. But Rare earth element is be indispensable to animals，now it isn't verdict,and have potential negative effect for agriculture entironment. It is recommended that the effects of RE on environment,agriculture and man should be further investigated. The text summarized research actuality on Rare earth element, and that rare earth element apply and acquire harvest in feedingstuff additive and affect flesh healthy.

Key words: rare earth element; ecotoxicity; feedingstuff additive; breeding application