RFID security is a key problem that restricts the development of networking technology. The paper describes the current situation and security system works in RFID, and analyzes the possible presence of various RFID security risks, and analyzes the characteristics of RFID security authentication method. This paper details the Hash-Lock protocol, Randomized Hash-Lock protocol, Hash chain protocol, hash-based implementation of the ID change protocol and other processes, and puts forward the corresponding security policies and recommendations. We hope for the development of things play a positive role.