Abstract: The superiority of fiberoptic distributed temperature sensor for tunnel monitoring is analyzed. The principle of distributed temperature measurement is introduced. Raman distributed temperature sensor and the highspeed sampling circuit are employed and connected to the temperature measuring system.Tunnel monitoring network is designed via the industrial computer and Modbus. The design process of hardware and software for the tunnel monitoring network is stated in detail. The application prospect of the monitoring system including the fiberoptic distributed temperature sensor will be brilliant in the future.