Abstract: First,the dimensionless linear equations were introduced.Then it was proved that the selection of reference systems had no influence on the categories of optimal impulsive rendezvous.By using three examples including two-impulse optimal rendezvous,two-impulse with coast optimal rendezvous and Hohmann optimal rendezvous,it was demonstrated that the choice of reference systems had no effect on the process of solving the corresponding optimal rendezvous model.Finally,analysis and simulation show that the selection of reference systems does affect the final results of the optimal rendezvous.