In the construction of large commercial complexes, industrial parks, or smart cities, the scale of security systems is often very large, including thousands or even tens of thousands of monitoring points, access points, and alarm points. The energy consumption of such a massive system should not be underestimated. Especially with the popularity of high-definition video surveillance, the demand for backend storage has surged, and the energy consumption of servers and storage devices has become the main consumption point. Faced with this challenge, the industry is exploring various energy-saving strategies. For example, adopting more efficient video encoding techniques (such as H.265/H.266) to reduce storage and transmission bandwidth requirements; Deploy intelligent analysis algorithms to record only abnormal events at high frame rates and reduce recording frame rates under normal conditions; Optimize equipment layout and reduce unnecessary coverage areas; Utilize natural light or existing lighting conditions to select cameras with wide dynamic range and low illumination performance, reducing the use of supplementary lighting equipment. Through the comprehensive application of these measures, the security system of large-scale projects can effectively "reduce the burden" and achieve a win-win situation of economic and environmental benefits.