Abstract: As RFID (Radio Frequency IDentification) system tag ownership cannot transfer completely and displays security problems, we propose a novel complete ownership transfer security protocol. Transaction relationship and identity comparison between the current and new owners is introduced to ensure that tag ownership is transferred to the legal new owners, and a key secondary synchronization update is used to ensure a complete ownership transfer of the RFID tag. In order to avoid malicious interference between the reader and the tag during the authenticate process, the new protocol adopts mutual authentication to protect RFID communication security. Formal proof and analysis results show that the proposed protocol not only can satisfy the requirements of complete ownership transfer, but also can defeat possible malicious attacks, which makes it more applicable.