通信领域中激光通信技术由于自身的优越性得到了广泛的应用。通过将空间激光通信与微波通信比较，介绍空间激光通信的优点：大容量、低功耗及体积小、质量轻等。叙述空间激光通信的基本原理。重点阐述空间激光通信系统大功率光源技术、高灵敏度抗干扰光信号接收技术、通信链路的快速及精确的捕获、跟踪和瞄准技术等关键技术。激光通信可广泛应用于**、经济等各个领域，必将有广阔的发展前景。

By Comparison with microwave communication,the advantages of the free-space laser communication system,such as big capacity,low power consumption,small volume and light weight,are introduced. The basic principle of the space laser communication is described. The key technologies in high-power light source,antijamming high sensitivity optical signal receiving,fast and precision capture,tracking and aiming of communication link in the space laser communication system,are put forward emphatically. The free-space laser communicationcan find wide applications in military and commercial fields and it has a great potential.