LEO constellation has been verified to achieve global coverage with low delay and large capacity Due to the slow fading of space communication and minimal environmental impact further research on inte

The constellation of LEO has been validated as capable of achieving global coverage with low latency and high capacity, and further research on inter-satellite links can enhance global communication efficiency due to the slow fading of space communication and minimal environmental impact. However, the spectrum resources in the ultra-dense satellite network are constrained, and the diminishing availability of satellite frequencies can lead to significant inter-satellite interference, particularly co-channel and adjacent frequency interference, which can significantly impact the performance of satellite communication systems. Therefore, the analysis, modeling, and suppression of inter-satellite links' interference have become increasingly vital, necessitating the design of an appropriate constellation architecture and the adoption of effective interference management strategies to reduce interference and enhance communication efficiency. This article explores the differences between inter-satellite interference and satellite-ground interference, examines the key factors affecting inter-satellite interference, and outlines the opportunities and challenges for the development of ultra-dense LEO inter-satellite links. By modeling Starlink, Kuiper, Telesat, and other LEO constellations, we simulate the actual constellations' interference during their movement and analyze the impact of satellite orbits, beams, and power on inter-satellite interference, providing valuable references for the research and optimization of satellite communication systems.