介绍了空间激光冷却原子钟地面原理样机的实验进展。该样机是以在空间微重力条件下应用为目标而研制的超高精度激光冷却铷原子钟,主要由物理单元、光学单元、微波单元和控制单元四个部分组成。该原理样机已经成功研制了空间冷原子钟所需要的超高真空系统、激光冷却光学平台、高性能微波源以及微波环形腔,实现了全过程自动运行,并获得了在地面重力条件下标志原子钟信号精度的Ramsey条纹,确定了高精度空间冷原子钟的主要科学参数和技术指标,为进一步空间工程应用奠定了科学和技术基础。 The experimental progress of space laser cooling atomic clock ground principle prototype is introduced. The prototype is based on the application of space under the conditions of microgravity for the development of ultra-high precision laser cooling rubidium atomic clock, mainly by the physical unit, optical unit, microwave unit and the control unit of four parts. The principle prototype has successfully developed the space required for cold atomic clock ultra-high vacuum system, laser cooling optical platform, high-performance microwave source and the microwave ring cavity, to achieve the entire process of automatic operation, and obtained under the conditions of gravitational ground mark atomic clock signal Accuracy of the Ramsey stripe, to determine the high-precision space cold atomic clock main scientific parameters and technical indicators, for further space engineering applications laid the foundation of science and technology.