Abstract: Ground based augmentation platform on compass was built from Guangdong Continuous Operational Reference System (GDCORS), and the positioning performance between the new and old platform had been tested. The results of RTK positioning are compared and analyzed from the aspects of internal accuracy， repeatability accuracy, external accuracy evaluation and initialization time. The Result indicate that the new platform can provide Network RTK service with high reliability and high accuracy,which can provide practical reference for GDCORS users to use the new／original platform.