Abstract: Real-time monitoring on shield cutter state during excavation is one of the key technologies to ensure the normal and efficient excavation of the shield machine. In order to grasp the change law of cutter wear and temperature during the tunneling process, and propose a cutter change proposal in time, a shield cutter wear and temperature on-line monitoring system based on wireless transmission was developed and the system was applied in a Xinjiang water diversion project. The results as followed:①The designed online monitoring system had high reliability, stable signal transmission, and can be adapted to the harsh working environment of the cutter head for long-term monitoring; ② During one cycle tunneling of this project, the amount of cutter wear was small, and the temperature change was about 2～3 °C; ③ The long-term monitoring result showed that the sensor could still work stably after the wear occurring without affecting the monitoring of wear value and temperature.