Abstract: This paper puts forward the scalable Mesh Tree Routing Protocol (SMTRP) to solve the serious decrease of network performance resulted from the increased routing latency in the large-scale network. By reflecting the network topology to logic addresses, introducing Mesh Adaptive Tree (MAT)and Adaptive Block Addressing (ABA)mechanism, each node is only required to maintain its own neighbor node's information within N hops. As a result, this protocol can verdict the direction of delivering the data packets, and dispense with maintenance of abundant routing tables, thus save a lot of storage space, reduces the communication overhead and energy consumption. The sealability of SMTRP Protocol has been proved theoretically and the validity of it has been validated by OMNET simulate platform.