Abstract:With the use of Continuous Operating Reference Station(CORT) technology in geodesy of large scale,it plays a key role in station distribution and data processing of the thirdorder GPS geodetic network. This technology not only accelerates the construction speed, increases the network flexibility, but also ensures the initial control and calculation accuracy. Compared with the previous situation, the CORT distribution density increased to 10 times totally, in key areas increased to 100 times. The observing means also have very great changes. On basis of the station of Chinese crustal motion network and CORT, the calculation and accuracy statistics of the thirdorder GPS geodetic network had been carried out in different areas. By contrast, the latter has the higher accuracy of thirdorder GPS geodetic network.