As an important part of national space infrastructure，low-Earth-orbit (LEO) remote sensing constellations play a key role in the fields such as disaster emergency response and environmental monitoring，but facing bottlenecks such as insufficient bandwidth for star-ground communication，limited computing power，and inefficient scheduling of heterogeneous resources.Though comprehensively analyzing the development status of LEO remote sensing constellations at home and abroad，typical LEO remote sensing systems，such as Starshield，Pelican，Jilin-1，and Haisi-1，are focused on to reveal the development trends of LEO remote sensing constellation information system technology.In view of the core challenges for LEO remote sensing constellation information systems，four major technological breakthrough directions are proposed，including mission management，intelligent processing，communication networking，and data fusion.In the future，LEO remote sensing constellations will evolve towards the architecture of “global interconnection，cloud-network fusion，and giant constellation”，and the full-link intelligence will be achieved through on-board operating systems and digital twin technology，providing core support for the space-ground integrated information network.The research results can provide references for the systematic construction and technological innovation paths of LEO remote sensing constellations.