Discussion of the Systematic Differences of the FK5

In the paper the positios and proper motions of the FK5 at J2000.0 to the Hipparcos re-sults are compared. It is shown that there are larger systematic differences for the FKS. In addition, we had also compared the positions of the photoelectric astrolabe catalogues of Yunnan and Shanghai Observatories in the FK5 system to the Hipparcos observations. The similar systematic differences for the FK5 are also reflected.