Abstract: This paper deals with some issues of the geodetic coordinate system,of which most are related to the national geodetic coordinate system.It is proposed that China geodetic coordinate system 2000 should be realized by coordinates and velocities of at least 2000 national level GNSS continuously operational stations and a certain amount of revisited GNSS stations for its maintenance and applications.It is identified that the updated period of a geodetic coordinate frame depends on the accuracy of its realization and the demands of the application concerned.Considering the requirements of 1∶1 000 scale mapping being to be met,the update period of the frame should be about 30 years.