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Aiming at the developing requirements of forestry monitoring network in informatization and intelligence, as well as the deficiencies of existing network application service, a wireless broadband network architecture design was developed. Based on the rapid development of SPTN (Software defines a packet transmission network) cable transmission network, a two-layer wireless broadband network was constructed from the functional application and system composition of the monitoring network，in order to meet the diversified application needs of forestry monitoring in the future. Network planning and network architecture design are carried out, and the application problems of anti-interference, security and lightning protection in wireless broadband network application are analyzed and explained. Through the calculation and evaluation of the communication performance of each node in the double-layer network, the feasibility of network scheme is verified, which meets the application requirements of large-scale deployment, high data transmission and fast network reorganization of forestry monitoring network, and provides a useful reference for the subsequent construction of forestry monitoring information network.