Polar regional communication has always been a difficulty in the field of satellite communication. In order to meet the needs of polar regional communication, a polar laser communication system based on polar orbit laser communication satellite and geosynchronous orbit laser relay satellite is designed. This paper analyzes the calculation and analysis model of satellite communication window, describes the application and application scenarios of the system communication link, simulates the polar communication window, and gives the window distribution list. The results show that the average daily communication window can reach 3.4-3.96 h.