The performance of detectors is one of the key factors for space target detection. In this paper， the performance requirements of blocked impurity band detectors for the ground-based detection scenario of space targets are analyzed. The theoretical calculation of background radiation and point target radiation is carried out by establishing the radiation transmission model of ground-based detection scenario. The correlation between radiation and detector performance is also analyzed. Taking space debris as a typical target and ground-based telescope as a carrying platform， the key performance requirements such as quantum efficiency， dark current， full well and specific detectivity are analyzed and calculated in the mid-latitude and high-altitude detection environment. This work lays a theoretical foundation for the detector structure design of ground-based detection.