自适应光学系统应用于天文观测时应满足一些技术要求，其中的关键技术之一是自适应光学系统为了对畸变的光波进行采样，需要在其很小的等晕角内有足够的信标强度。激光引导星，即人造信标，就是解决这种问题的方法之一。特别是在观测天文暗目标时，其自身的光强度不能为波前探测提供信息，激光引导星就显得非常重要．根据国际上的最新进展对激光引导星技术给予了介绍，重点介绍了激光引导星的局限性，对近几年提出的对激光引导星可能的倾斜测量技术也进行了简介。 Adaptive optical system should meet some technical requirements when applied to astronomical observation. One of the key technologies is that adaptive optical system needs enough beacon intensity within its small isometric halo to sample the distorted light wave . Laser guide stars, artificial beacons, is one of the ways to solve this problem. Especially when observing astronomical dark targets, its own light intensity can not provide information for the wavefront detection, laser guide star is very important. According to the latest developments in the world, laser guidance star technology is introduced. The limitations of laser guidance star are introduced emphatically. The possible inclination measurement technology of laser guiding star introduced in recent years is also introduced.