Common-track constellation is a special kind of constellation,all ground tracks of satellites are in one track.With recursive orbit or quasi-recursive orbit,the ground track of the constellation is a closed loop with a repeating track.In particular,if the constellation is in one orbit plane,the constellation can meet the requirement for a multi-sat-ellite launch mission and fast satellite-satellite link establishment.The characteristics and coverage properties of a com-mon-track constellation in one orbit plane are studied in this paper.The simulation results show that a common-track constellation in one orbit plane can provide favorable coverage to a target station in the polar areas.