在多颗卫星轨道的设计过程中，经常要考虑卫星对地球的覆盖情况。本文针对多颗卫星在某一时刻是否对地球进行了全球覆盖进行了探讨，并给出了一种简单的判定方法及其对应的算法，同时对这一方法进一步推广为判定是否多颗卫星同时对地球进行了Ｎ次覆盖。本文给出的方法对于卫星网设计有一定的帮助 During the design of multiple orbits, it is often necessary to consider the coverage of the Earth by the satellite. In this paper, whether multiple satellites cover the earth at any one time or not is discussed. A simple decision method and its corresponding algorithm are given. At the same time, this method is further extended to determine whether multiple satellites simultaneously N times the Earth has been covered. The method presented in this paper is of some help to the design of satellite networks