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The safety interlocking and state monitoring system is important for wind tunnel to keep safety. The signals about safety interlocking and state monitoring are collected in real-time and reliably through EtherCAT looped network. The system joins in several networks. The equipment components of the system and function of software are introduced. The software of PLC part that makes safety locking strategies before and during blowing come true is designed by TwinCAT2, which protects the safety of wind tunnel. The state monitoring software designed by LabVIEW2015. The system utilizes data from several networks through TCP/IP, OPC and so on, and has the function to store and search data by using several submodule of LabVIEW DSC, which makes the tracing to the source easily. The application results show that the system has good real-time performance and reliability, complete functions and friendly interface. It effectively guarantees the safety of wind tunnel and equipment in the use process, and provides effective analysis means for equipment performance analysis.