To the speciality of a long distance communication, this paper analyses the problem of the existing small satellite inter-satellite links system in the long distance inter-satellite communication such as the communication access field is narrowed or even interrupted, and proposes an improved method and design. By calculation and simulation analysis on STK, the feasibility of the design is verified. The results show that the improved inter-satellite links system is suitable for the long distance communication , and it is applicable to small satellites and other LEO satellites.