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This work focuses on the magnetic properties of the carbonyl iron-polymer composite for radio frequency identification use.The composite materials were kneaded by test roller with the carbonyl iron powder and polymer, and then pressed to sheet form.It was found that carbonyl iron-rubber composite sheet could evidently enhance electromagnetic field at least 10 db.Also, to further increase the detected distance, readability, detected angle.The result also revealed that the composite could increase the induced voltage from 4 V to 22 V.