Abstract: Up to now, all the LEO mission officials have published precision orbit determination results without phase pattern correction information. In fact, phase pattern error is one of the main sources of error for POD. In this paper, the phase pattern error model is established and based on GRACE real data, the PCV is gained directly from estimated parameters. Finally, some evaluations are conducted with KBR and SLR,the experiment results show that the POD improved greatly when estimated PCV.