More and more observational evidence has demonstrated that the Dome A region where Kunlun Station is located has the best ground-based astronomical observation conditions in optical, infrared, and terahertz wave bands. It has excellent free-atmosphere seeing, extremely low precipitable water vapor, a very dark sky background at night, and months of continuous observation time during polar nights. Through a summary of work in the past seventeen years, this article focuses on the comprehensive site survey work at Dome A and presents the measurement results as well as the latest progress.