Taking Shenzhen CORS system as an example, this paper performs high-precision calculation on the GPS data of Trimble and Panda receivers from 11 reference stations. By analyzing the difference of baseline accuracy and positioning results between Trimble and Panda receivers, the feasibility in urban CORS system and accuracy of the domestic GPS receiver are then evaluated. The results show that the difference between the NRMS values of the two receivers is small, and the difference of the baseline repetition is also kept in the scale of millimeters, and the maximal difference of the coordinate components after the constraint adjustment is not more than 5 mm. Furtherly, linear least-squares fitting of the baseline repetition shows that both the fixed error and the proportional error coefficient of both receivers meet the specification requirements.