Though low in content,trace elements have an important biological effect on organisms,so more and more people realize the importance of study on trace elements.Forms and the validity of the trace ele- ments in soil had been researched.The content of trace elements in agroecosystems、factors that affect the ratio of cycling and the general situation about the cycling of trace elements in agroecosystems were re- viewed.The prospects on the cycling of trace elements in agroecosystems were also put forward.