Abstract: The key agreement is an important part of the secure communication. By the key agreement protocol. the shared session key is established between communication nodes in order to achieve secure communications in network. In the context of the Internet of Things, the authenticated key agreement protocol proposed in this paper is based on identity-based authenticated key agreement protocol without the bilinear pairing. The protocol mainly includes three parts: initialization, parameter extraction and key agreement. Comparing with the key agreement protocol using bilinear pairings, the protocol not only provides the same level of security and scalability, but also has obvious advantages in terms of energy overhead, time overhead and computational complexity.