In recent years, wireless networking technology has become more and more popular. Many people connect to the internet via wireless networks. If WISP wants to provide wireless service in a large area, using wireless to connect between mesh-enabled APs can save money and support fast network deployment. Today, many vendors use proprietary methods to implement Wi-Fi Mesh networking, so we need a standard to meet the requirement of interoperability. The objective of this paper is to introduce the current status and technical evolution of Wi-Fi Mesh standard-IEEE 802.11s.