Abstract: Now,however,traditional teaching methods fail to satisfy the particularity of the RFID system.In this paper, a key management scheme for RFID is proposed, which combines CPK (Combined Public Key) cryptography. The detailed contents, including initializing system, producing key, distributing key, and transmitting data securely,are described.This solution solves small storage and weak compute capability problems. It is matched to the processing power of terminal equipment of RFID.The study shows that the approach has some important features,such as small storage,high security and high running efficiency.And it provides new means for key management of RFID.