Abstract: Problems in monitoring are analyzed. Monitoring process control is studied. Criterion and technical key points of monitoring process control are proposed. Conclusions drawn are as follows: 1) Only when the monitoring process is well controlled and the monitoring data are well compared to the actual performance, can accurate and timely warning be given. 2) Implementing 6 monitoring systems is an effective way to obtain reliable monitoring data. 3) The monitoring efficiency can be improved if the precision requirement for the monitoring instruments and devices is properly lowered and the monitoring is well coordinated with the construction process.

Key words: tunnel construction, monitoring, process control, technical key points