In this paper, we study an observation system for electromagnetic interference measurement for during the electrical systems with long-term uninterrupted power supply. Firstly, a simple and efficient long-term electromagnetic interference measurement system based on electromagne tic compatibility standard instruments and programming in Lab Viewis proposed This system can able to obtain time domain and frequency domain electromagnetic interference without manual intervention at the same time. Moreover, by tested and verified, this system works stably and meet the monitoring requirements of electromagnetic interference measurement with automated. This system has good support for the construction of inteUigent electromagnetic compatibility laboratory for better versatility and scalability.