To deal with the requirements of automatic control and failure protection during the reliable test of IR component, a system to monitor the testing was proposed. Programmable logic controller (PLC) was used as the control center. By use of the profibus-DP bus as the communication bus, the field device was monitored in real time and coordinated to operate in sequence. And then the testing environment was automatically maintained. The failure protection would automatically run when the testing environment failures. Meanwhile, based on Wincc flexible, the operational status of equipment was displayed and stored the operational status of equipment in real-time with the human-machine interface. Finally, a reliable experiment was performed by use of the monitoring system, and the results show that the monitoring system can run stably. By use of which the auto maintaining vacuum is superior to 10^-4 Pa, and the auto maintaining temperature is lower than 90 K, which can satisfy the requirements of the reliable test of IR component.