Laser communication is regarded as the development direction of the new generation communication technology due to its advantages of high transmission rate and large communication capacity. It is expected to play an important role in the sixth-generation communication technology, and building inter satellite laser communication links has become one of the research focuses of satellite networks. This article first introduces the advantages of inter satellite laser communication links compared to traditional satellite networks. It elaborates on the research hotspots and development status of capture technology, communication transmission technology, and inter satellite routing technology from the architecture construction of inter satellite laser communication. It also introduces the existing technology methods for integrating laser and RF communication. Finally, it looks forward to the future development of inter satellite laser communication.