The limitation of classical adaptive optics (AO) system and the basic principle of multi-conjugate adaptive optics (MCAO) a system are briefly introduced.

• 摘要介绍了传统AO系统的局限性和MCAO的基本原理，根据相关文献对单、双共轭AO系统等晕角进行了推导，并对共轭高度的选取进行了深入的探讨。