在介绍空地激光通信链路总体设计思路的基础上对设计过程中涉及的“通信链路设计指标分配”、“大气信道对总体设计的影响分析”、“通信子系统设计”、“光束的捕 获、对准、跟踪(acquisition,pointing and trackingAPT)子系统设计”、“光学系统设计”等内容中的重要概念进行了研究。对空地激光通信链路总体设计思路及重要概念 进行研究，有助于我们做好空地激光通信系统的总体设计工作，对实现空地激光通信具有非常重要的意义。

Based on the introduction of the overall design considerations for the spacetoground optical communication link, the research on some important concepts, such as parameters’coordination in the design of communication link, effect of atmospheric channels on system design, design of communication subsystem, subsystem design of beam APT (acquisition, pointing and tracking) , optical system design and so on, involved in the design process,is discussed in this paper. All the work we did would help us to know the spacetoground optical communication very well and realize it ultimately.