In order to quickly and accurately predict the health status of the system, a temperature measurement method based on SAW technology in wireless sensor network is proposed. The detection method uses the unidirectional radar pulse triggered by the switch to provide the transmission and reception channels through the radio modem. According to the structure of the sensor, the cross-section characteristics of the cooperative target are characterized to restore the physical quantity that defines the material characteristics of the transducer. At the same time, the anti-interference processing methods in the communication from interrogator to interrogator and from sensor to interrogator are given. The effectiveness of the proposed method has been verified by the indoor and outdoor temperature measurement experiments lasting for one and a half years, which can support industrial system monitoring and health status assessment.