Abstract: With the rapid development of new energy power fields, network security has become a key challenge in the operation of unmanned power fields. Intrusion Detection System (IDS), as an important technology for network security protection, can effectively monitor and deal with complex network threats. Based on IDS, this paper discusses in detail its behavior analysis, deep packet inspection, machine learning attack pattern recognition, and collaborative intrusion response in unmanned new energy power fields, and proposes effective network security protection strategies to deal with potential network threats and enhance overall security.